Patched an unresolved case where knocking back a bard/dancer would cause the mapserver to crash (bugreport:1043)

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12249 54d463be-8e91-2dee-dedb-b68131a5f0ec

Changelog-Trunk.txt

@@ -4,6 +4,8 @@ AS OF SVN REV. 5091, WE ARE NOW USING TRUNK.  ALL UNTESTED BUGFIXES/FEATURES GO
 IF YOU HAVE A WORKING AND TESTED BUGFIX PUT IT INTO STABLE AS WELL AS TRUNK.
 
 2008/02/27
+	* Patched an unresolved case where knocking back a bard/dancer would
+	  cause the mapserver to crash (bugreport:1043)
 	* Fixed Apple of Idun not checking for bard soul link (bugreport:1028)
 	* Fixed Advanced Adrenaline Rush not working barehanded (bugreport:1049)
 	* Disabled idle_no_autoloot setting (bugreport:1051)

src/map/skill.c

@@ -9822,7 +9822,8 @@ int skill_unit_move_unit_group (struct skill_unit_group *group, int m, int dx, i
 	struct skill_unit *unit1;
 	struct skill_unit *unit2;
 
-	nullpo_retr(0, group);
+	if (group == NULL)
+		return 0;
 	if (group->unit_count<=0)
 		return 0;
 	if (group->unit==NULL)