ATTO should add missing <UL> tags

Hello,

ATTO-editor should add <ul></ul> tags to start and end of a paste that has <li>-list if they are missing from the paste.

So if you paste:

<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>

ATTO should modify this to:

<ul>
<li>Coffee</li>
<li>Tea</li>
<li>Milk</li>
</ul>

If you don't have these <ul> -tags it breaks the layout of the whole course.