Add required=True to image path argument in print subcommand #112
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Added required=True parameter to the Click 'image' argument in the print subcommand to ensure that the script does not continue forward with the print process when no file path is provided. Changes were verified by connecting to brother-ql 810W and running the following command and checking that it (correctly) fails:
sudo env PATH=$PATH ./cli.py -b pyusb -m QL-810W -p usb://0x04f9:0x209c --debug print -l 62For regression testing, the command was attempted again with a valid file path and checked that the printer successfully prints.