fix(core,nodes,edges): nullish check for event obj

packages/core/src/composables/useNodeHooks.ts

@@ -17,47 +17,47 @@ export default function useNodeHooks(node: GraphNode, emits: VueFlowStore['emits
 
   nodeHooks.doubleClick.on((event) => {
     emits.nodeDoubleClick(event)
-    node.events.doubleClick?.(event)
+    node.events?.doubleClick?.(event)
   })
 
   nodeHooks.click.on((event) => {
     emits.nodeClick(event)
-    node.events.click?.(event)
+    node.events?.click?.(event)
   })
 
   nodeHooks.mouseEnter.on((event) => {
     emits.nodeMouseEnter(event)
-    node.events.mouseEnter?.(event)
+    node.events?.mouseEnter?.(event)
   })
 
   nodeHooks.mouseMove.on((event) => {
     emits.nodeMouseMove(event)
-    node.events.mouseMove?.(event)
+    node.events?.mouseMove?.(event)
   })
 
   nodeHooks.mouseLeave.on((event) => {
     emits.nodeMouseLeave(event)
-    node.events.mouseLeave?.(event)
+    node.events?.mouseLeave?.(event)
   })
 
   nodeHooks.contextMenu.on((event) => {
     emits.nodeContextMenu(event)
-    node.events.contextMenu?.(event)
+    node.events?.contextMenu?.(event)
   })
 
   nodeHooks.dragStart.on((event) => {
     emits.nodeDragStart(event)
-    node.events.dragStart?.(event)
+    node.events?.dragStart?.(event)
   })
 
   nodeHooks.drag.on((event) => {
     emits.nodeDrag(event)
-    node.events.drag?.(event)
+    node.events?.drag?.(event)
   })
 
   nodeHooks.dragStop.on((event) => {
     emits.nodeDragStop(event)
-    node.events.dragStop?.(event)
+    node.events?.dragStop?.(event)
   })
 
   return Object.entries(nodeHooks).reduce(