fix(examples): totalHeight 0 on remove last element reorder animation

Co-authored-by: Shahar Dawn Or <mightyiampresence@gmail.com>

examples/reorder-animation/index.js

@@ -90,7 +90,9 @@ function render () {
     m.offset = last ? last.offset + last.elmHeight + margin : margin
     return acc.concat(m)
   }, [])
-  totalHeight = data[data.length - 1].offset + data[data.length - 1].elmHeight
+  totalHeight = data.length === 0
+    ? 0
+    : data[data.length - 1].offset + data[data.length - 1].elmHeight
   vnode = patch(vnode, view(data))
 }