Null ref in MultiTargetPath.cs

I got a null reference exception at line 374 in PathFinders/MultiTargetPath.cs. It has happened a couple of times, and leads to Unity doing an Assert.

I think this is fixed in the dev. version, I know there is at least one null reference exception fixed for multi target path in that release. You could try it and see if it works.

I just added the null checks from the dev version of MultiTargetPath,cs to the last release and it fixes the problem.