Make fire ball and dark ball a sprite. Fix a crash again.

mods/lord/Core/projectiles/src/projectiles/entity.lua

@@ -52,10 +52,10 @@ local function punch_target(projectile, target, damage_groups, remove_after_hit,
 	projectile.object:remove()
 end
 
---- @param entity LuaEntity  entity to check if it is a projectile
+--- @param entity ObjectRef  entity to check if it is a projectile
 --- @return       boolean    true, if it is a projectile, or false
 local function is_entity_projectile(entity)
-	if not entity then
+	if not entity or not entity:get_luaentity() then
 		return
 	end
 	local entity_name = entity:get_luaentity().name
@@ -110,7 +110,7 @@ end
 
 -- Hit handling depending on target
 --- @param projectile    LuaEntity  projectile entity
---- @param target        LuaEntity  target entity
+--- @param target        ObjectRef  target entity
 --- @param damage_groups table      damage groups table (see Minetest API)
 --- @param velocity      vector     projectile velocity
 local function hit_handling(projectile, target, damage_groups, velocity)

mods/lord/Tools/lord_projectiles/src/lord_projectiles/config.lua

@@ -224,8 +224,8 @@ return {
 			},
 			entity_reg  = {
 				initial_properties = {
-					visual    = "item",
-					wield_item = "lord_projectiles:fire_ball",
+					visual   = "sprite",
+					textures = { "mobs_fireball.png" },
 					visual_size = vector.new(1, 1, 1),
 				},
 				max_speed        = 40,
@@ -316,8 +316,8 @@ return {
 			},
 			entity_reg  = {
 				initial_properties = {
-					visual    = "item",
-					wield_item = "lord_projectiles:dark_ball",
+					visual   = "sprite",
+					textures = { "lottmobs_darkball.png" },
 					visual_size = vector.new(1, 1, 1),
 				},
 				max_speed        = 20,