Add null check for type_vec in VerifyVector function

src/reflection.cpp

@@ -156,6 +156,7 @@ static bool VerifyVector(flatbuffers::Verifier& v,
       auto type_vec = table.GetPointer<Vector<uint8_t>*>(vec_field.offset() -
                                                          sizeof(voffset_t));
       if (!v.VerifyVector(type_vec)) return false;
+      if (!type_vec) return true;
       if (type_vec->size() != vec->size()) return false;
       for (uoffset_t j = 0; j < vec->size(); j++) {
         //  get union type from the prev field
@@ -800,4 +801,4 @@ bool VerifySizePrefixed(const reflection::Schema& schema,
                       /*required=*/true);
 }
 
-}  // namespace flatbuffers
+}  // namespace flatbuffers