Improved exception handling for shutdown procedures

src/vpn_manager_globalprotect/backend.py

@@ -358,14 +358,17 @@ class GlobalProtectConnection(
         if self._wait_task is not None:
             self._wait_task.cancel()
         self._disconnecting = True
-        self._proc.terminate()
+        try:
+            self._proc.terminate()
+        except:
+            # Process doesn't exist, we are in the state we want so... :shrug: this is fine
+            return
         # If the process takes longer than 10 seconds to exit, kill it sith WIGKILL
         try:
             async with timeout(10):
                 await self._proc_wait_task
         except TimeoutError:
             self._proc.kill()
-            await self._proc_wait_task
 
     async def temporary_disconnect(self):
         f"""{super().temporary_disconnect.__doc__}"""