Fixed: fields without values are visible (EXPOSUREAPP-3988) (#1808)

* fixed: fields without values are visible; + logs

* detect version update, force recalc on 1.7 -> 1.8

* detect version update in diagnosis keys task only

* no connection type ignoring

* Add test to ensure that parsing old configs from 1.7.x fails and the default fallback for 1.8.x is used.

* Fix logging typo.

* no wasLastDetectionPerformedRecently abort on app update

* Fix lint issues

* fixed condition

* used shared settings

* get last encounter at from enf v1 to display second line after app update while risk level calc is not finished

* fixed di

* fixed tests

* fixed tests

* fixed tests

* Add unit tests for DownloadDiagnosisKeysTask.kt

* fixed tests

* Add tests for DownloadDiagnosisKeysSettingsTest

Co-authored-by: Matthias Urhahn <matthias.urhahn@sap.com>