chore(nodes): prevent crashing when data is not set on nodes object

src/components/Nodes/DefaultNode.tsx

@@ -12,7 +12,7 @@ const DefaultNode = ({
   return (
     <>
       <Handle type="target" position={targetPosition} isConnectable={isConnectable} />
-      {data.label}
+      {data?.label}
       <Handle type="source" position={sourcePosition} isConnectable={isConnectable} />
     </>
   );

src/components/Nodes/InputNode.tsx

@@ -5,7 +5,7 @@ import { NodeProps, Position } from '../../types';
 
 const InputNode = ({ data, isConnectable, sourcePosition = Position.Bottom }: NodeProps) => (
   <>
-    {data.label}
+    {data?.label}
     <Handle type="source" position={sourcePosition} isConnectable={isConnectable} />
   </>
 );

src/components/Nodes/OutputNode.tsx

@@ -6,7 +6,7 @@ import { NodeProps, Position } from '../../types';
 const OutputNode = ({ data, isConnectable, targetPosition = Position.Top }: NodeProps) => (
   <>
     <Handle type="target" position={targetPosition} isConnectable={isConnectable} />
-    {data.label}
+    {data?.label}
   </>
 );