fix(queryexecutor): send code for succes with final block

Author: hannahhoward

Diff for: responsemanager/queryexecutor/queryexecutor.go

@@ -120,7 +120,7 @@ func (qe *QueryExecutor) executeQuery(
 	err := qe.runTraversal(p, rt)
 
 	_, isPaused := err.(hooks.ErrPaused)
-	if isPaused {
+	if err == nil || isPaused {
 		return err
 	}
 
@@ -132,8 +132,6 @@ func (qe *QueryExecutor) executeQuery(
 	// Close out the response, either temporarily (pause) or permanently (cancel, fail, complete)
 	return rt.ResponseStream.Transaction(func(rb responseassembler.ResponseBuilder) error {
 		switch err {
-		case nil:
-			rb.FinishRequest()
 		case ErrFirstBlockLoad:
 			rb.FinishWithError(graphsync.RequestFailedContentNotFound)
 		case ErrCancelledByCommand:
@@ -259,6 +257,12 @@ func (qe *QueryExecutor) sendResponse(p peer.ID, taskData ResponseTask, link ipl
 				return result.Err // halts the traversal and returns to the top-level `err`
 			}
 		}
+		if err == nil {
+			isComplete, err := taskData.Traverser.IsComplete()
+			if isComplete && err == nil {
+				rb.FinishRequest()
+			}
+		}
 		return err
 	})
 }