Fix error when inserting image into a span inside a list

[caffodian]

There is a bug in the webkit span fixer code where when it is called on a span without a class, an error occurs. The most common place we see this is when inserting images into spans within lists. (Span alone causes the span to split, instead)

[winhamwr]

a bug in the webkit span fixer code

Just to be clear, this bug exists with classless spans in any browser, right?

[winhamwr]

This needs an item in the changelog. After that, it looks good.

Up for making a release or would you prefer to wait until the other insertion bug is fixed?

[caffodian]

Just to be clear, this bug exists with classless spans in any browser, right?

It happens in Chrome, at least. The class attr is undefined and then toLowerCase gets called on it.

This needs an item in the changelog. After that, it looks good.

Up for making a release or would you prefer to wait until the other insertion bug is fixed?

Will do, still figuring out how to contribute. I haven't tracked down our other insertion bug yet, but I suspect that this fix also covers doing nearly anything inside a span (as long as the span doesn't get split by the command)