Fix tab name update call at register, now in load handler

Fail in background mode with --addons flag to force enable addon.
should not be in register since it should happen after a full register.

__init__.py

@@ -4,7 +4,7 @@ bl_info = {
     "name": "Background plane manager",
     "description": "Manage the background image planes and grease pencil object relative to a camera",
     "author": "Samuel Bernou",
-    "version": (0, 5, 2),
+    "version": (0, 5, 3),
     "blender": (3, 5, 0),
     "location": "View3D",
     "warning": "",
@@ -14,6 +14,7 @@ bl_info = {
 
 import bpy
 from pathlib import Path
+from bpy.app.handlers import persistent
 
 from . import operators
 from . import import_planes
@@ -59,6 +60,11 @@ except Exception:
 # TODO: Add an enum in prefs to choose default type to use
 # Override this enum if there is an environement variable in project
 
+@persistent
+def subscribe_tab_update(dummy):
+    ## Update UI Tab name in sidebar
+    preferences.ui_in_sidebar_update(core.get_addon_prefs(), bpy.context)
+
 modules = (
     import_planes,
     operators,
@@ -71,8 +77,11 @@ def register():
     for m in modules:
         m.register()
 
-    preferences.ui_in_sidebar_update(core.get_addon_prefs(), bpy.context)
+    ## Update UI Tab name in sidebar (Disabled : cause Error in CLI when enabling addon with "--addons" flag)
+    # preferences.ui_in_sidebar_update(core.get_addon_prefs(), bpy.context)
+    bpy.app.handlers.load_post.append(subscribe_tab_update)
 
 def unregister():
+    bpy.app.handlers.load_post.remove(subscribe_tab_update)
     for m in reversed(modules):
         m.unregister()

preferences.py

@@ -17,7 +17,7 @@ def ui_in_sidebar_update(self, _):
     if hasattr(bpy.types, BPM_PT_bg_manager_panel.bl_idname):
         try:
             bpy.utils.unregister_class(BPM_PT_bg_manager_panel)
-        except:
+        except Exception:
             pass
 
     BPM_PT_bg_manager_panel.bl_category = self.category.strip()