PLT-7826: Don't fetch posts from store if ES returns none. (#7596)

app/post.go

@@ -602,6 +602,7 @@ func (a *App) SearchPostsInTeam(terms string, userId string, teamId string, isOr
 
 		// Get the posts
 		postList := model.NewPostList()
+		if len(postIds) > 0 {
 			if presult := <-a.Srv.Store.Post().GetPostsByIds(postIds); presult.Err != nil {
 				return nil, presult.Err
 			} else {
@@ -610,6 +611,7 @@ func (a *App) SearchPostsInTeam(terms string, userId string, teamId string, isOr
 					postList.AddOrder(p.Id)
 				}
 			}
+		}
 
 		return postList, nil
 	} else {