Fix crash when trying to apply weather to dead players

lib/trigger.lua

@@ -90,6 +90,7 @@ function trigger.get_active_effects()
 		for _, player in ipairs(minetest.get_connected_players()) do
 			local pname = player:get_player_name()
 			local env = environments[pname]
+			if env ~= nil then
 				if is_weather_active(player, wname, env) then
 					if type(climate_mod.current_weather[pname]) == "nil" then
 						climate_mod.current_weather[pname] = {}
@@ -108,6 +109,7 @@ function trigger.get_active_effects()
 				end
 			end
 		end
+	end
 	return effects
 end