IronLanguages/main — pull request #210 by vincentducros (2014-07-22 07:36:13+00:00)
Title: Update CommonDictionaryStorage.cs

Python dictionary serialized in version 2.6 can't be deserialized in version 2.7 due to the GetValue("nullvalue").
nullvalue entry was not present in version 2.6 and .Net framework throw an exception in GetValue.
So the exception need to be catch.