fix: Better error message when subscription path is invalid.

[jiangmichaellll]

No description provided.

[codecov]

Codecov Report

Merging #87 (9561a01) into master (05e293f) will increase coverage by 1.15%.
The diff coverage is 50.00%.

@@             Coverage Diff              @@
##             master      #87      +/-   ##
============================================
+ Coverage     58.31%   59.46%   +1.15%     
- Complexity       81       82       +1     
============================================
  Files            17       17              
  Lines           523      528       +5     
  Branches         17       18       +1     
============================================
+ Hits            305      314       +9     
+ Misses          215      210       -5     
- Partials          3        4       +1     

Impacted Files	Coverage Δ	Complexity Δ
...e/cloud/pubsublite/spark/PslDataSourceOptions.java	19.56% <50.00%> (+8.20%)	3.00 <0.00> (+1.00)
...m/google/cloud/pubsublite/spark/PslSparkUtils.java	95.71% <0.00%> (+0.06%)	14.00% <0.00%> (ø%)

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[anguillanneuf]

Some lines are not covered by tests?

[jiangmichaellll]

it's now all covered.