Ensuring app_service variable is bound in finally block

requirements-dev.lock

@@ -67,7 +67,7 @@ rich==13.7.1
 sniffio==1.3.1
     # via anyio
     # via httpx
-textual==0.74.0
+textual==0.75.1
     # via textual-serve
 typing-extensions==4.12.2
     # via anyio

requirements.lock

@@ -50,7 +50,7 @@ pygments==2.18.0
 rich==13.7.1
     # via textual
     # via textual-serve
-textual==0.74.0
+textual==0.75.1
     # via textual-serve
 typing-extensions==4.12.2
     # via rich

src/textual_serve/server.py

@@ -274,6 +274,7 @@ class Server:
         width = to_int(request.query.get("width", "80"), 80)
         height = to_int(request.query.get("height", "24"), 24)
 
+        app_service: AppService | None = None
         try:
             await websocket.prepare(request)
             app_service = AppService(
@@ -296,6 +297,7 @@ class Server:
             log.exception(error)
 
         finally:
-            await app_service.stop()
+            if app_service is not None:
+                await app_service.stop()
 
         return websocket