ConsiderEmptyDataSourceAsInconclusive throws to catch the exception on the next line

[Jakub Jareš]

When 0 items are produced and the code does not throw, we throw just to catch the exception. This could be made more efficient by extracting the catch and using it in if and catch paths.

https://grep.app/search?q=%26%26%20.%2AConsiderEmptyDataSourceAsInconclusive&regexp=true

Code is introduced here: https://github.com/microsoft/testfx/pull/2771/files

PR has no comments that would mention this.