Doctest invocation stripping for Python tutor fails if there is whitespace between the import and the call

[chvp]

For example: https://dodona.ugent.be/nl/submissions/10253786/

[bmesuere]

@chvp do you still remember what goes wrong here? (i.e. what is the expected behaviour)
This might be relevant now since we're working on the Tutor.

[chvp]

This code fails if there are blank lines in the __main__ if statement (as in the linked submission). If you use the python tutor on the linked submission you will see that there is a lost doctest.testmod() in the code shown in the tutor.

Expected behaviour is that the doctest.testmod() is stripped as well (or the tutor setting __name__ to something else than "__main__" would work as well I guess).