DynamoDS/Dynamo — pull request #1234 by ke-yu (2014-03-10 04:59:56+00:00)
Title: Defined variables in CBN should include unbound variable that has input

This submission is to fix MAGN-2169 Adding imperative code block node in Dynamo breaks VM.

To find out whether a variable has been defined or not in other CBN, we should include those unbound variables but have inputs, these unbound variables should be treated as defined variables as well.