fix(tests): ensure the client is open when stopping screen recording

[no changelog]

python/src/trezorlib/debuglink.py

@@ -618,6 +618,11 @@ class TrezorClientDebugLink(TrezorClient):
             Callable[[protobuf.MessageType], protobuf.MessageType],
         ] = {}
 
+    def ensure_open(self) -> None:
+        """Only open session if there isn't already an open one."""
+        if self.session_counter == 0:
+            self.open()
+
     def open(self) -> None:
         super().open()
         if self.session_counter == 1:

tests/ui_tests/__init__.py

@@ -153,6 +153,7 @@ def screen_recording(
         client.debug.start_recording(str(screen_path))
         yield
     finally:
+        client.ensure_open()
         # Wait for response to Initialize, which gives the emulator time to catch up
         # and redraw the homescreen. Otherwise there's a race condition between that
         # and stopping recording.