[Python] Fix recently introduced PEP 8 regressions.
[Python] Fix recently introduced PEP 8 regressions.

Prior to this commit:

$ flake8
./utils/omit-needless-words.py:54:67: E225 missing whitespace around operator
./utils/omit-needless-words.py:66:1: W293 blank line contains whitespace
./utils/omit-needless-words.py:100:1: W293 blank line contains whitespace
$

After this commit:

$ flake8
$

khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift,khizkhiz/swift