Cleanup props when parent object no longer exists

A timed event to check for the existence of the rezzing object and cleanup when the check fails.

AVsitter2/Plugins/AVprop/[AV]object.lsl

@@ -21,6 +21,7 @@ integer prop_id;
 integer prop_point;
 integer experience_denied_reason;
 key originalowner;
+key parentkey;
 key give_prop_warning_request;
 
 unsit_all()
@@ -89,6 +90,11 @@ state prop
         {
             llSetClickAction(CLICK_ACTION_TOUCH);
         }
+        if(llGetStartParameter())
+        {
+            parentkey = llList2String(llGetObjectDetails(llGetKey(), [OBJECT_REZZER_KEY]), 0);
+            llSetTimerEvent(10);
+        }
     }
 
     attach(key id)
@@ -235,6 +241,22 @@ state prop
             llSay(comm_channel, "SAVEPROP|" + (string)prop_id);
         }
     }
+    
+    timer()
+    {
+        //the parent key should be stored global?
+        if(llGetBoundingBox(parentkey) == [])
+        {
+            if(!llGetAttached())
+            {
+                llDie();
+            }
+            else
+            {
+                llRequestPermissions(llGetOwner(), PERMISSION_ATTACH);
+            }
+        }
+    }
 }
 
 state restart_prop