Fix(Spawn):add nil gaurd to InitRandomizeZones

Moose Development/Moose/Core/Spawn.lua

@@ -1184,6 +1184,7 @@ end
 
 --- This method provides the functionality to randomize the spawning of the Groups at a given list of zones of different types.
 -- @param #SPAWN self
+-- @param #table SpawnZoneTable A table with @{Core.Zone} objects. If nil or empty, the method returns self without effect.
 -- @param #table SpawnZoneTable A table with @{Core.Zone} objects. If this table is given, then each spawn will be executed within the given list of @{Core.Zone}s objects.
 -- @param #boolean RandomizePositionInZone If nil or true, also the position inside the selected random zone will be randomized. Set to false to use the center of the zone.
 -- @return #SPAWN self
@@ -1201,6 +1202,9 @@ end
 function SPAWN:InitRandomizeZones( SpawnZoneTable, RandomizePositionInZone )
   --self:F( { self.SpawnTemplatePrefix, SpawnZoneTable } )
   
+  if not SpawnZoneTable then 
+    return self 
+  end;
   local temptable = {}
   for _,_temp in pairs(SpawnZoneTable) do
     temptable[#temptable+1] = _temp