Fix verbose output when using existing gcov files #144
latk left a comment
Thank you for this excellent pull request! I love it that you added the test case to validate these changes
I just have a few minor nitpicks that I'd like to see addressed before I merge…
When gcovr is invoked with `-v` and `-g` switches, it fails with error: ``` .... print(' source_fname '+source_fname) TypeError: cannot concatenate 'str' and 'NoneType' objects ``` This patch disables printing of `source_fname` when `source_fname is None`
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