Fixed: AIS crash if variable not initialized (forgot to commit)

--HG--
branch : develop

code/ryzom/server/src/ai_service/state_instance.h

@@ -431,8 +431,8 @@ std::string CStateInstance::getStrNelVar(std::string const& varId)
 		return "";
 	}
 
-	_StrNelVar[varId] = new NLMISC::CVariable<std::string>("StateInstanceVar", varId.c_str(), "", std::string());
+	_StrNelVar[varId] = new NLMISC::CVariable<std::string>("StateInstanceStrVar", varId.c_str(), "", std::string());
-	return _NelVar[varId]->get();
+	return _StrNelVar[varId]->get();
 }
 
 inline