Add a test case for element binding when an exception is thrown

This is to add a test case to verify that when an exception is thrown in the rebinding process, the related Revit elements will be cleared. In the test case, at first, 8 family instances are created. Then one input value is changed, and 8 family instances should be updated but in the process, exceptions are thrown and as a result, the 8 family instances will not be tracked by us any more. At last, when the input value is changed and 8 new family instances will be created. As a result, there will be 16 family instances.

As this test case is currently failing, I have attributed this test case in the Failure category.

@lukechurch 
PTAL