Handle constants correctly in cdbpullup_findPathKeyExprInTargetList
If a PathKey contains a constant member, it can be evaluated without any entries in the target list, and can always be returned in cdbpullup_findPathKeyExprInTargetList. This fixes the "Unexpected intarnal error" you got with the included test query. Closes issue #348, reported by liruto. Thanks for the report!
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