check easy to make globbing mistake

[JoeZiminski]

Today I made the error:

files = filepath.glob("*")
assert any(files)
for file in files:
    ...

Of course the any call eats the first element from the generator. Check this pattern in datashuttle, in general convert to list of the bat we are rarely going to deal with so many files a generator is useful and it is very easy to make mistakes when refactoring such code.