fix: reset connection state if cancel fails

src/aare/devices/jfjoch.py

@@ -72,7 +72,11 @@ class JFJochWrapper:
         self._api = jfjoch_client.DefaultApi(self._client)
         # set before cancel(), which is itself decorated and would otherwise recurse
         self._connected = True
-        self.cancel(on_init=True)
+        try:
+            self.cancel(on_init=True)
+        except:
+            self._connected = False
+            raise
 
     @staticmethod
     def _extract_status_code(error: Exception) -> int | None: