Add null check before tip.hide() on mouseout

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/module/cytoscapeMap.js

@@ -281,7 +281,7 @@ export default function cytoscapeMap(mapData, dataLayerType, dataLayerOption, cu
     if (node.data("label").length > 10) tip.show();
   });
   cy.on('mouseout', 'node', function (event) {
-    tip.hide();
+    tip?.hide();
   });
 
   // here we remember and recall positions