Disabled the check for python code in order to reduce the runtime of 'pylearn2/scripts/papers/dropout/tests/test_dropout.py'

As suggested by nouiz , I disabled the check for python code in order to reduce the runtime to 3 hours in DEBUG_MODE.
It was like this before the PR, but this is pretty bad practice. Always replace it by this or something more specific:

except Exception:

Otherwise, this will also catch ctrl-c. We don't want that.