Fix the go return bad_type when the vertex without the tag (#1273)

Co-authored-by: Yee <[email protected]>

src/context/Iterator.cpp

@@ -298,6 +298,9 @@ const Value& GetNeighborsIter::getTagProp(const std::string& tag,
     auto colId = index->second.colIdx;
     auto& row = *currentRow_;
     DCHECK_GT(row.size(), colId);
+    if (row[colId].empty()) {
+        return Value::kEmpty;
+    }
     if (!row[colId].isList()) {
         return Value::kNullBadType;
     }

tests/tck/features/go/GO.feature

@@ -1821,3 +1821,14 @@ Feature: Go Sentence
       """
     Then the result should be, in any order, with relax comparison:
       | like._dst |
+
+  Scenario: with no existed tag
+    When executing query:
+      """
+      GO FROM 'Tony Parker' OVER like YIELD $$.player.name, $^.team.name
+      """
+    Then the result should be, in any order, with relax comparison:
+      | $$.player.name      | $^.team.name |
+      | "LaMarcus Aldridge" | EMPTY        |
+      | "Manu Ginobili"     | EMPTY        |
+      | "Tim Duncan"        | EMPTY        |