TypeError: argument of type 'NoneType' is not iterable

[sarahgguwu]

Encountering this error in the logs with a refresh interval set to 10, config.yaml is below the log.

I2021-06-24 04:37:32,445 [root] starting v1.6.9 with args: /src/run.py --alerter discord --webhook https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0ATc
I2021-06-24 04:37:33,614 [root] discord alerter initialized with kwargs: webhook_url=https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0ATc
E2021-06-24 04:37:33,615 [root] caught exception
Traceback (most recent call last):
  File "/src/run.py", line 58, in main
    config = parse_config(args.config)
  File "/src/config.py", line 47, in parse_config
    refresh_interval = data['refresh_interval'] if 'refresh_interval' in data else 1
TypeError: argument of type 'NoneType' is not iterable
I2021-06-24 04:39:38,425 [root] starting v1.6.9 with args: /src/run.py --alerter discord --webhook https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0AT
I2021-06-24 04:39:39,580 [root] discord alerter initialized with kwargs: webhook_url=https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0AT
E2021-06-24 04:39:39,581 [root] caught exception
Traceback (most recent call last):
  File "/src/run.py", line 58, in main
    config = parse_config(args.config)
  File "/src/config.py", line 47, in parse_config
    refresh_interval = data['refresh_interval'] if 'refresh_interval' in data else 1
TypeError: argument of type 'NoneType' is not iterable
I2021-06-24 04:44:24,578 [root] starting v1.6.9 with args: /src/run.py --alerter discord --webhook https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0AT
I2021-06-24 04:44:26,300 [root] discord alerter initialized with kwargs: webhook_url=https://discord.com/api/webhooks/857479264924598275/4D-9DJPzmQULSJunU0SNjhawqxbBIvko8GU6i7DbQMSMfgqqq2W2YkMFEbnTWofu0AT

---
refresh_interval: 10 # seconds
max_price: 1000 # dollars/euros/etc
urls:
  - https://www.amazon.ca/dp/B08KWPDXJZ/
  - https://www.amazon.ca/dp/B08L8LG4M3
  - https://www.amazon.ca/dp/B08L8JNTXQ
  - https://www.amazon.ca/dp/B08L8KC1J7
  - https://www.amazon.ca/dp/B08L8L9TCZ
  - https://www.amazon.ca/dp/B08LW46GH2
  - https://www.amazon.ca/dp/B08L8L71SM
  - https://www.amazon.ca/dp/B08KY322TH
  - https://www.amazon.ca/dp/B08KXZV626
  - https://www.amazon.ca/dp/B08KY266MG
  - https://www.amazon.ca/dp/B08KWN2LZG
  - https://www.amazon.ca/dp/B08KWPDXJZ
  - https://www.amazon.ca/dp/B08KWLMZV4
  - https://www.amazon.ca/dp/B08HBF5L3K
  - https://www.amazon.ca/dp/B08HBJB7YD
  - https://www.amazon.ca/dp/B08LF32LJ6
  - https://www.amazon.ca/dp/B08LF1CWT2
  - https://www.bhphotovideo.com/c/product/1602755-REG/asus_dualrtx30708g_geforce_rtx_3070_8g.html
  - https://www.bhphotovideo.com/c/product/1602756-REG/asus_strixrtx3070o8_rog_strix_geforce_rtx.html
  - https://www.bhphotovideo.com/c/product/1598689-REG/gigabyte_gv_n3070gaming_oc_8gd_geforce_rtx_3070_gaming.html
  - https://www.bhphotovideo.com/c/product/1599833-REG/gigabyte_gv_n3070eagle_8gd_geforce_rtx_3070_eagle.html
  - https://www.bhphotovideo.com/c/product/1606949-REG/gigabyte_gv_n306teagle_8gd_rtx_3060_ti_eagle.html
  - https://www.bhphotovideo.com/c/product/1609756-REG/asus_ko_rtx3060ti_o8g_gaming_ko_geforce_rtx_3060.html
  - https://www.bhphotovideo.com/c/product/1607025-REG/asus_tuf_rtx3060ti_o8g_gaming_geforce_rtx_3060_ti.html
  - https://www.bhphotovideo.com/c/product/1609440-REG/pny_technologies_vcg3060t8dfxppb_geforce_rtx_3060_ti.html
  - https://www.bhphotovideo.com/c/product/1606946-REG/gigabyte_gv_n306tgamingoc_pro_8gd_rtx_3060_ti_gaming.html
  - https://www.bhphotovideo.com/c/product/1606948-REG/gigabyte_gv_n306teagle_oc_8gd_rtx_3060_ti_eagle.html
  - https://www.bhphotovideo.com/c/product/1606945-REG/gigabyte_gv_n306taorus_m_8gd_aorus_rtx_3060_ti.html
  - https://www.bhphotovideo.com/c/product/1606947-REG/gigabyte_gv_n306tgaming_oc_8gd_rtx_3060_ti_gaming.html
  - https://www.bhphotovideo.com/c/product/1610844-REG/msi_g306tv2xc_geforce_rtx_3060_ti.html
  - https://www.bhphotovideo.com/c/product/1608081-REG/zotac_zt_a30610e_10m_gaming_geforce_rtx_3060.html
  - https://www.bhphotovideo.com/c/product/1608111-REG/zotac_zt_a30610h_10m_gaming_geforce_rtx_3060.html
  - https://www.newegg.com/asrock-radeon-rx-6800-xt-rx-6800-xt-16g/p/N82E16814930045
  - https://www.newegg.com/asus-radeon-rx-6800-xt-rx6800xt-16g/p/N82E16814126472
  - https://www.newegg.com/gigabyte-radeon-rx-6800-xt-gv-r68xt-16gc-b/p/N82E16814932373
  - https://www.newegg.com/msi-radeon-rx-6800-xt-rx-6800-xt-16g/p/N82E16814137607
  - https://www.newegg.com/sapphire-radeon-rx-6800-xt-21304-01-20g/p/N82E16814202388  
  - https://www.memoryexpress.com/Products/MX00116013
  - https://www.memoryexpress.com/Products/MX00116061
  - https://www.memoryexpress.com/Products/MX00114689
  - https://www.memoryexpress.com/Products/MX00114567
  - https://www.memoryexpress.com/Products/MX00114560
  - https://www.memoryexpress.com/Products/MX00114405
  - https://www.memoryexpress.com/Products/MX00114607
  - https://www.memoryexpress.com/Products/MX00114688
  - https://www.memoryexpress.com/Products/MX00114024
  - https://www.memoryexpress.com/Products/MX00116017
  - https://www.memoryexpress.com/Products/MX00114003
  - https://www.memoryexpress.com/Products/MX00116016
  - https://www.memoryexpress.com/Products/MX00116528
  - https://www.memoryexpress.com/Products/MX00114092
  - https://www.memoryexpress.com/Products/MX00114785
  - https://www.memoryexpress.com/Products/MX00114448
  - https://www.memoryexpress.com/Products/MX00114566
  - https://www.memoryexpress.com/Products/MX00113954
  - https://www.memoryexpress.com/Products/MX00116063
  - https://www.memoryexpress.com/Products/MX00114606
  - https://www.memoryexpress.com/Products/MX00113956
  - https://www.memoryexpress.com/Products/MX00115353
  - https://www.memoryexpress.com/Products/MX00114093
  - https://www.memoryexpress.com/Products/MX00115134
  - https://www.memoryexpress.com/Products/MX00114404
  - https://www.memoryexpress.com/Products/MX00114155
  - https://www.memoryexpress.com/Products/MX00116653
  - https://www.memoryexpress.com/Products/MX00115232
  - https://www.memoryexpress.com/Products/MX00117162
  - https://www.memoryexpress.com/Products/MX00116163
  - https://www.memoryexpress.com/Products/MX00114407
  - https://www.memoryexpress.com/Products/MX00115133
  - https://www.memoryexpress.com/Products/MX00116071
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  - https://www.memoryexpress.com/Products/MX00115474
  - https://www.memoryexpress.com/Products/MX00114940
  - https://www.memoryexpress.com/Products/MX00114939
  - https://www.memoryexpress.com/Products/MX00114938
  - https://www.memoryexpress.com/Products/MX00114997