Weird '<i>' proposal for object key completion

Consider the following snippet:

```
var markdowns = {
  // assist here
};

var s = "abc";
return markdowns[s];
```

If you invoke content assist where the comment indicates, you get a single proposal named ```<i>```. I would expect to get no proposals, or even better, ```"abc"```.

This can be reproduced in the Tern demo page.