[flang][OpenMP]Replace assert with if-condition (#139559) If a symbol is not declared, check-omp-structure hits an assert. It should be safe to treat undeclared symbols as "not from a block", as they would have to be declared to be in a block... Adding simple test to confirm it gives error messages, not crashing. This should fix issue #131655 (there is already a check for symbol being not null in the code identified in the ticket).
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