Recording pretends to start but doesn't with disconnected sensors

[sebromero]

Describe the bug
When one of the sensors on the sensor card is not connected and the recording button is tapped, the action area switches to the recording mode, the navigation controller doesn't.

To Reproduce
Steps to reproduce the behavior:

1. Open an experiment
2. Add a bluetooth sensor that is not connected
3. Start recording
4. See the incorrect behaviour of the action area

Expected behavior
The user should be presented with a message saying that either, recording is currently not possible, or give the user the option to proceed recording without the disconnected sensor. The latter option is more user friendly but maybe it's an edge case that we don't need to consider.

Screenshots