Various flake8 fixes.

- Removed tabs.
- Fixed E731 do not assign a lambda expression, use a def.
- avoid hasattr

CHANGES.rst

@@ -29,6 +29,7 @@ Bug fixes:
   user to fill in the form without validation error.  Or when in the
   control panel the field is set as not required anymore, that change
   would have no effect until the instance was restarted.  [maurits]
+- Cleaned code from flake8 errors.  [maurits]
 
 
 2.4.14 (2016-06-06)

plone/app/discussion/browser/conversation.py

@@ -8,6 +8,7 @@ from Products.CMFCore.interfaces import IFolderish
 from Products.CMFCore.utils import getToolByName
 from Products.CMFPlone.interfaces import INonStructuralFolder
 from Products.CMFPlone.interfaces import IPloneSiteRoot
+from Products.CMFPlone.utils import safe_hasattr
 from zope.component import queryUtility
 
 
@@ -132,7 +133,7 @@ class ConversationView(object):
             return False
 
         # Check if discussion is allowed on the content object
-        if hasattr(context, 'allow_discussion'):
+        if safe_hasattr(context, 'allow_discussion'):
             if context.allow_discussion is not None:
                 return context.allow_discussion
 

plone/app/discussion/contentrules.py

@@ -17,7 +17,8 @@ except ImportError:
 try:
     from plone.app.contentrules.handlers import execute
 except ImportError:
-    execute = lambda context, event: False
+    def execute(context, event):
+        return False
 
 
 def execute_comment(event):