Add debug and fallback to gallery metadata handler

ui/events/run_handlers.py

@@ -116,13 +116,19 @@ def create_run_event(prefix: str, task_type: str, ui_components: dict):
         )
         # When a user selects an image from the global Gallery tab, load its generation info
         def _show_meta(selected_path, *_):
+            # `selected_path` may be a string (filepath) or a list of filepaths.
             try:
+                # Normalise to a single path
+                path = selected_path[0] if isinstance(selected_path, (list, tuple)) else selected_path
+                print(f"[DEBUG] Gallery selected path: {path}")
                 from PIL import Image
-                with Image.open(selected_path) as im:
-                    meta = im.info.get('parameters', '')
-            except Exception:
-                meta = ''
-            return meta
+                with Image.open(path) as im:
+                    meta = im.info.get("parameters", "")
+            except Exception as e:
+                print(f"[DEBUG] Failed to read metadata: {e}")
+                meta = ""
+            # If no metadata present, show a friendly placeholder.
+            return meta if meta else "(ไม่มีข้อมูลเมตาดาต้า)"
         # Connect the select event of the global gallery to update its metadata textbox
         gallery_tab = ui_components.get('gallery')
         if gallery_tab: