fix: fallback to default url if a skull's texture is broken

Author: darbyjack

src/main/kotlin/me/glaremasters/guilds/guis/ListGUI.kt

@@ -101,8 +101,8 @@ class ListGUI(private val guilds: Guilds, private val settingsManager: SettingsM
         val defaultUrl = settingsManager.getProperty(GuildListSettings.GUILD_LIST_HEAD_DEFAULT_URL)
         val useDefaultUrl = settingsManager.getProperty(GuildListSettings.USE_DEFAULT_TEXTURE)
 
-        val item = if (!useDefaultUrl && guild.skull != null && guild.guildSkull != null) {
-            guild.skull
+        val item = if (!useDefaultUrl && guild.guildSkull != null) {
+            guild.guildSkull?.createSkull() ?: GuildSkull(defaultUrl).itemStack
         } else {
             GuildSkull(defaultUrl).itemStack
         }