Tweak for action filter in Collection Export

Waiting a proper solution for props declaration:
- Filter now happen even if the list is not displayed
- Avoid spaming console with error, display a label saying what to do

addons/io_scene_gltf2/__init__.py

@@ -1109,6 +1109,15 @@ def execute(self, context):
         # All custom export settings are stored in this container.
         export_settings = {}
 
+        # Collection Export does not handle correctly props declaration for now
+        # So use this tweak to manage it, waiting for a better solution
+        is_file_browser = context.space_data.type == 'FILE_BROWSER'
+        if not is_file_browser:
+            if not hasattr(context.scene, "gltf_action_filter") and self.export_action_filter:
+                bpy.types.Scene.gltf_action_filter = bpy.props.CollectionProperty(type=GLTF2_filter_action)
+                bpy.types.Scene.gltf_action_filter_active = bpy.props.IntProperty()
+
+
         # Get log level from parameters
         # If not set, get it from Blender app debug value
         export_settings['gltf_loglevel'] = self.export_loglevel

addons/io_scene_gltf2/blender/com/gltf2_blender_ui.py

@@ -660,6 +660,13 @@ def export_panel_animation_action_filter(layout, operator):
 
         row = body.row()
 
+        # Collection Export does not handle correctly property declaration
+        # So use this tweak to avoid spaming the console, waiting for a better solution
+        is_file_browser = bpy.context.space_data.type == 'FILE_BROWSER'
+        if not is_file_browser and not hasattr(bpy.data.scenes[0], "gltf_action_filter"):
+            row.label(text="Please disable/enable 'action filter' to refresh the list")
+            return
+
         if len(bpy.data.actions) > 0:
             row.template_list(
                 "SCENE_UL_gltf2_filter_action",