fix(api): don't panic if PATCH /users/@me does not have "fields" set

backend/routes/user/patch_user.go

@@ -71,6 +71,7 @@ func (s *Server) patchUser(w http.ResponseWriter, r *http.Request) error {
 		}
 	}
 
+	if (req.Fields) != nil {
 		// max 25 fields
 		if len(*req.Fields) > db.MaxFields {
 			return server.APIError{
@@ -88,6 +89,7 @@ func (s *Server) patchUser(w http.ResponseWriter, r *http.Request) error {
 				}
 			}
 		}
+	}
 
 	// start transaction
 	tx, err := s.DB.Begin(ctx)