tests: Resolve pep8 issues

Signed-off-by: Stephen Finucane <stephen@that.guru>

Author: stephenfin

patchwork/tests/browser.py

@@ -23,7 +23,7 @@
 
 try:
     from django.contrib.staticfiles.testing import StaticLiveServerTestCase
-except:  # Django < 1.7
+except ImportError:  # Django < 1.7
     from django.test import LiveServerTestCase as StaticLiveServerTestCase
 from selenium.common.exceptions import (
     NoSuchElementException, StaleElementReferenceException,