Add default view for unhandled exceptions

to give the user a bit of low-down as to what should happen next...

tailbone/views/common.py

@@ -68,6 +68,12 @@ class CommonView(View):
         """
         return self.home(mobile=True)
 
+    def exception(self):
+        """
+        Generic exception view
+        """
+        return {'project_title': self.project_title}
+
     def about(self):
         """
         Generic view to show "about project" info page.
@@ -115,6 +121,9 @@ class CommonView(View):
         # auto-correct URLs which require trailing slash
         config.add_notfound_view(cls, attr='notfound', append_slash=True)
 
+        # exception
+        config.add_exception_view(cls, attr='exception', renderer='/exception.mako')
+
         # home
         config.add_route('home', '/')
         config.add_view(cls, attr='home', route_name='home', renderer='/home.mako')