WI #2817 Prevent from NullReferenceException in completion after IN/OF#2820
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Fixes #2817
I cannot reproduce the problem.
However we see that we cannot add a null symbol or a symbol with null name in the symbol table (cf
SymbolTable.AddVariable).Therefore, it is very likely that the right-hand side of the predicate is null, i.e.
firstVariableName.