DynamoDS/Dynamo — pull request #2996 by pboyer (2014-11-06 20:04:41+00:00)
Title: Fix hard crash of Revit on Dynamo crash

### Issue

Right now, in the majority of cases, a hard crash of Dynamo will also cause a hard crash of Revit. In the `Dispatcher` exception in DynamoRevit, we use a reference to `RevitDynamoModel