Fix crash when obj tele's Nether→Overworld @ rain

mods/CORE/mcl_worlds/init.lua

@@ -104,6 +104,7 @@ local last_dimension = {}
 
 -- Notifies this mod about a dimension change of a player.
 -- * player: Player who changed the dimension
+-- * dimension: New dimension ("overworld", "nether", "end", "void")
 function mcl_worlds.dimension_change(player, dimension)
 	for i=1, #mcl_worlds.registered_on_dimension_change do
 		mcl_worlds.registered_on_dimension_change[i](player, dimension)

mods/ENVIRONMENT/mcl_weather/weather_core.lua

@@ -91,7 +91,7 @@ end
 -- it is costly to generate many particles around player so goal is focus mainly on front view.  
 mcl_weather.get_random_pos_by_player_look_dir = function(player)
   local look_dir = player:get_look_dir()
-  local player_pos = player:getpos()
+  local player_pos = player:get_pos()
 
   local random_pos_x = 0
   local random_pos_y = 0

mods/ITEMS/mcl_portals/portal_nether.lua

@@ -434,8 +434,8 @@ minetest.register_abm({
 
 						-- Teleport
 						obj:set_pos(target)
-						mcl_worlds.dimension_change(obj, mcl_worlds.pos_to_dimension(target))
 						if obj:is_player() then
+							mcl_worlds.dimension_change(obj, mcl_worlds.pos_to_dimension(target))
 							minetest.sound_play("mcl_portals_teleport", {pos=target, gain=0.5, max_hear_distance = 16})
 						end