Update app.py

app.py

@@ -666,10 +666,16 @@ def build_catalogue() -> str:
     """
     try:
         s = load_index()
-    except Exception:
-        return "<p>Catalogue unavailable — index not loaded.</p>"
-
-    styles = s["styles"]
+        styles = s["styles"]
+    except Exception as exc:
+        import traceback
+        # Swallowing this silently rendered an invisible panel and looked like
+        # the section had simply not been built.
+        return (f"<div style='color:#E0574B;font-family:monospace;font-size:.75rem;"
+                f"border:1px solid #E0574B;padding:12px;margin-top:24px'>"
+                f"Catalogue unavailable: {_esc(type(exc).__name__)}: {_esc(exc)}"
+                f"<pre style='color:#8FB6D0;white-space:pre-wrap'>"
+                f"{_esc(traceback.format_exc()[-800:])}</pre></div>")
     first = {}
     for pid, sid in zip(s["plate_ids"], s["style_of"]):
         first.setdefault(sid, pid)
@@ -945,6 +951,8 @@ with gr.Blocks(css=CSS, title="Facade — architectural style finder",
         with gr.Column(scale=7):
             out = gr.HTML(EMPTY_HTML)
 
+    with gr.Row():
+        show_cat = gr.Button("Show the 20 styles this can identify", size="sm")
     catalogue = gr.HTML()
 
     def do_geocode(q):
@@ -973,6 +981,10 @@ with gr.Blocks(css=CSS, title="Facade — architectural style finder",
     )
 
     go.click(identify, [img, use_loc, lat, lon, weight, live_text], out)
+
+    # Rendered on load, with a manual trigger as a fallback: the load event is
+    # the one piece of this page that fails invisibly if it does not fire.
+    show_cat.click(build_catalogue, None, catalogue)
     demo.load(build_catalogue, None, catalogue)
 
 if __name__ == "__main__":