Check exception after QM_ASSIGN of undef var

While most other exceptions aren't possible when QM_ASSIGN is used
instead of ASSIGN, we still have to watch out for an undef var
notice

Check exception after QM_ASSIGN of undef var

While most other exceptions aren't possible when QM_ASSIGN is used
instead of ASSIGN, we still have to watch out for an undef var
notice being promoted to an exception.

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