Java: Fix false positives in evaluation-to-constant query for ErrorType

Author: IdrissRio

java/ql/src/Likely Bugs/Arithmetic/ConstantExpAppearsNonConstant.ql

@@ -19,7 +19,7 @@ predicate isConstantExp(Expr e) {
   // A literal is constant.
   e instanceof Literal
   or
-  e instanceof TypeAccess
+  exists(TypeAccess ta | ta = e | not ta.getType() instanceof ErrorType)
   or
   e instanceof ArrayTypeAccess
   or