Revert "Reraise the original exception to debug Travis failure"

This reverts commit e81e2bf4.

weblate/trans/machine/base.py

@@ -233,7 +233,6 @@ class MachineTranslation(object):
                 self.request_url,
                 self.request_params,
             )
-            raise
             raise MachineTranslationError('{}: {}'.format(
                 exc.__class__.__name__,
                 str(exc)