[2.3.0] Checkmk Werk 16889 created: ewon: KeyError (device)

[//]: # (werk v2) # ewon: KeyError (device) key | value ---------- | --- date | 2024-08-06T07:48:07+00:00 version | 2.3.0p13 class | fix edition | cre component | checks level | 1 compatible | yes An existing rule for `check_ewon` without the mandatory key `device` would result in an exception `KeyError (device)`. This change makes the check function use a default, if `device` is not set.