Too Many Connection-Error Notifications for Polar-Observations

[ja-fra]

• For the Polar Verity observation, the device connection error message should not appear when there are no upcoming Polar observations scheduled. (iOS and Android)

• Sometimes the error message is displayed even when the device is connected. (iOS)

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Originally raised by @alireza-dhp in #200 (comment)

[andresgruber]

With version 4.0.14 the behavior is that, the Error screen appears only at sign in and at days, where a polar observation is scheduled.

Asking for connecting the external device at first registering as a participant seems useful, because one wants to check, whether the participant has access to the polar device at all.