Fallback to Python Verovio for generated scores

apps/theme_lab/app.py

@@ -379,7 +379,7 @@ def render_musicxml_with_python_verovio(musicxml_path: Path, svg_path: Path) ->
 
         toolkit = verovio.toolkit()
         toolkit.setOptions({"scale": 42})
-        if not toolkit.loadFile(str(musicxml_path)):
+        if not toolkit.loadFile(str(musicxml_path)) and not toolkit.loadData(musicxml_path.read_text(encoding="utf-8")):
             return None
         svg_path.write_text(toolkit.renderToSVG(1), encoding="utf-8")
     except Exception:
@@ -403,8 +403,8 @@ def render_musicxml_to_svg(musicxml_path: Path) -> Path | None:
             timeout=20,
         )
     except (subprocess.SubprocessError, OSError):
-        return None
-    return svg_path if svg_path.exists() else None
+        return render_musicxml_with_python_verovio(musicxml_path, svg_path)
+    return svg_path if svg_path.exists() else render_musicxml_with_python_verovio(musicxml_path, svg_path)
 
 
 def markov_cache_key(request: GenerateRequest) -> tuple[object, ...]: