fix: cancel out of no changes save (#4335)

Cancel out of trying to save

web/src/components/MemoEditor/index.tsx

@@ -336,6 +336,9 @@ const MemoEditor = (props: Props) => {
           }
           if (updateMask.size === 0) {
             toast.error("No changes detected");
+            if (onCancel) {
+              onCancel();
+            }
             return;
           }
           const memo = await memoStore.updateMemo(memoPatch, Array.from(updateMask));