Test filters fail with Additional Test Apks

[runningcode]

When using test filters and additional test apks:
If we use a filter which only matches tests in the instrumentation test apk but matches 0 tests in an additional test apk, flank will fail with:
All tests filtered out

Is this the expected result? In 8.1.0 flank would run successfully. In the current flank snapshot this fails in the above manner. What is the expected behavior?

[pawelpasterz]

Filters are used to match tests in each apk-test pair separately. If pair has all tests filtered out, flank run is terminated. Looks like we are missing that case you mentioned. Thanks for reporting that!

cc @bootstraponline

[bootstraponline]

We should probably ignore when there are zero tests in a particular APK instead of erroring. #739 is a related bug.Thanks for reporting!