Fix collection error for .txt files #704
Merged
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Fixes a bug that caused an internal pytest error when collecting .txt files.
When pytest encounters a .txt file, it is collected as a DoctestTextFile. Although DoctestTextFile is considered a subtype of Module, its obj property is always None and causes an INTERNALERROR.
https://github.com/pytest-dev/pytest/blob/714ce2e872f0e1dc3b0363949d084e3e64f88c82/src/_pytest/doctest.py#L422-L423
Resolves #703