Item12986: Crash when transitioning to a form that doesn't have the same fields

Given a topic where a state transition on that topic is governed by entries in the topic form, if the topic form in the target of the transition doesn't also support those same fields, then the conditions on the transition may fail.

For example, you might have a field "ApproverNames" that the Workflow accesses using %QUERY{"ApproverNames"}%. This will be correctly expanded at the start of the transition, but when it comes to the save the form will have changed and unless the ApproverNames field is also in the new form, there will be a crash.

Fix by checking the transition using the meta for the existing topic, and not that for the transitioned topic.

-- CrawfordCurrie - 08 Aug 2014

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