update(docs): fix view height

docs/pages/examples/basic.vue

@@ -1,5 +1,6 @@
 <script lang="ts" setup>
-import Flow, {
+import {
+  Flow,
   MiniMap,
   Controls,
   Background,
@@ -26,12 +27,9 @@ const elements = ref<Elements>([
 ])
 const rfInstance = ref<FlowInstance | null>(null)
 const onElementsRemove = (elementsToRemove: Elements) => (elements.value = removeElements(elementsToRemove, elements.value))
-const onConnect = (params: Edge | Connection) => {
-  elements.value = addEdge(params, elements.value)
-  console.log(params)
-}
+const onConnect = (params: Edge | Connection) => (elements.value = addEdge(params, elements.value))
 const onLoad = (flowInstance: FlowInstance) => {
-  flowInstance.fitView({ padding: 0.1 })
+  flowInstance?.fitView({ padding: 0.1 })
   rfInstance.value = flowInstance
 }