Fixed #1181. Do not change that setProperty to setPropertyDer, it has to be as it is.
Sketchy fix for BattleAIs colliding ith their callbacks.

git-svn-id: https://vcmi.svn.sourceforge.net/svnroot/vcmi/trunk@3118 4dfc6b2a-8b31-0410-aa91-d6c70e3ac834