mysociety/pombola — pull request #1415 by mhl (2014-05-08 11:25:31+00:00)
Title: Don't try to return boundary changes for places with no MapIt area

We were getting error emails for a couple of places that had no MapIt
area associated with them - these are historic data where it's going to
be difficult to get missing data, so let's just settle for not showing
boundary changes for these cases.

Fixes #1335 and #1377.