Only initialize registry when needed

lua/custom_loadout/cl_main.lua

@@ -184,7 +184,6 @@ function CLoadout:Init()
         self.frame = nil
     end
 
-    self:InitRegistry()
     self:Load()
 
     if #self.loadouts == 0 then

lua/custom_loadout/cl_ui.lua

@@ -26,12 +26,16 @@ function CLoadout:UpdateLists()
 end
 
 function CLoadout:ShowPanel()
-    if not self.categories then
-        CLoadout.PrintF( "Too early! Weapons have not been loaded and categorized yet!" )
+    if not self.loadouts then
+        CLoadout.PrintF( "Too early! The addon is not prepared!" )
 
         return
     end
 
+    if not self.categories then
+        self:InitRegistry()
+    end
+
     if IsValid( self.frame ) then
         self.frame:Close()
         self.frame = nil