cehck broken modifier layer targets

1.9.5

- added: `Check file` also check if GP modifiers have broken layer target
- changed: `Check file` disable drawing guide is now On by default

properties.py

@@ -83,7 +83,7 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
     disable_guide : BoolProperty(
         name="Disable Drawing Guide",
         description="Disable constrained guide in draw mode", 
-        default=False, options={'HIDDEN'})
+        default=True, options={'HIDDEN'})
 
     list_disabled_anim : BoolProperty(
         name="List Disabled Animation",
@@ -100,6 +100,11 @@ class GP_PG_FixSettings(bpy.types.PropertyGroup):
         description="Alert if some GP modifier have different show viewport and show render values", 
         default=True, options={'HIDDEN'})
 
+    list_broken_mod_targets : BoolProperty(
+        name="List GP Object modifiers broken target",
+        description="Alert if some GP modifier have a target layer not existing in layer stack", 
+        default=True, options={'HIDDEN'})
+
     autokey_add_n_replace : BoolProperty(
         name="Autokey Mode Add and Replace",
         description="Change autokey mode back to 'Add & Replace'",