Small Improvement to prevent RTF go into wierd state

DynamoDS / RevitTestFramework

Unit Testing on Revit

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Small Improvement to prevent RTF go into wierd state #57

Closed QilongTang closed 7 years ago

QilongTang commented 7 years ago

Cherry pick from R2018 branch. I have seen RTF churn at the following line because missing such null check. Small Improvement to prevent RTF go into wierd state.