check if the regexps exist before trying to use them (lots of "None"s being highlighted because of no checking)"

mitterlib/ui/helpers/gtk_messagegrid.py

@@ -187,6 +187,7 @@ class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
                 message_values['message'])
 
         # highlight users
+        if data.user_regexp:
             user_mask = '(%s)' % (data.user_regexp)
             user_re = re.compile(user_mask, re.I)
             mask = r'<span foreground="%s">\1</span>' % (self.user_color)
@@ -194,6 +195,7 @@ class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
                     message_values['message'])
 
         # highlight groups
+        if data.group_regexp:
             group_mask = '(%s)' % (data.group_regexp)
             group_re = re.compile(group_mask, re.I)
             mask = r'<span foreground="%s">\1</span>' % (self.group_color)
@@ -201,6 +203,7 @@ class MessageGrid(gtk.ScrolledWindow, gobject.GObject):
                     message_values['message'])
 
         # highlight tags
+        if data.tag_regexp:
             tag_mask = '(%s)' % (data.tag_regexp)
             tag_re = re.compile(tag_mask, re.I)
             mask = r'<span foreground="%s">\1</span>' % (self.tag_color)