Don't replace empty response with null. That empty response may be place holder for other async resource (Reference,Connection)

Author: Dragomir-Ivanov

schema/query/projection_evaluator.go

@@ -214,10 +214,6 @@ func evalProjection(ctx context.Context, p Projection, payload map[string]interf
 return fmt.Errorf("%s: error resolving field handler on sub-field: %v", name, err)
 }
 }
-// Return `null` for missing result instead of empty object
-if m, ok := v.(map[string]interface{}); ok && len(m) == 0 {
-v = nil
-}
 resMu.Lock()
 res[name] = v
 resMu.Unlock()

schema/query/projection_evaluator_test.go

@@ -236,7 +236,7 @@ func TestProjectionEval(t *testing.T) {
 `reference{name}`,
 `{"reference":"100"}`,
 nil,
-`{"reference":null}`,
+`{"reference":{}}`,
 },
 {
 "Connection#1",