Uncaught TypeError: Cannot set property 'w' of undefined

Even with the updated jquery.flot.resize.js I was still recieving this
error in IE8, same as issue #1081

> Uncaught TypeError: Cannot set property 'w' of undefined

Simply fixed by adding changing the following

Original:
```js
function s(t,i,s){
    var o=$(this),u=o.data(a);
    u.w=i!==n?i:o.width(), u.h=s!==n?s:o.height(),
r.apply(this,arguments)
}
```

to include a conditional Conditional:

```js
function s(t,i,s){
    var o=$(this),u=o.data(a);
    if(u){
        u.w=i!==n?i:o.width(), u.h=s!==n?s:o.height(),
r.apply(this,arguments)
    }
}
```

No more error, resizing still works