[World Editor] Fixing Crashes in Code

I built the world editor from trunk source and had a few instances where I could get it to crash with a null reference exception.

I fixed them in my local code, but it probably makes sense to get them into the source repo. So I guess this is me asking to sign up as as Multiverse developer, particularly for the tools and other C# bits. I work more than full time so wouldn't be contributing hugely, but it would be nice to drop in a few bugfixes here and there. Check the LinkedIn link in my profile for an overview, or I can chat offline with members of the dev team if you prefer.

What is your sourceforge login ?

xangis

Checked in a few code changes to improve things. If anyone can make any of the tools crash on trunk I'd be happy to take a look.