[TASK] Deactivate code coverage until unit tests are written

As there aren't unit tests at all, scrutinizer states
a code coverage of 100% which is wrong.

Releases: 2.0.0
Change-Id: I389b86d2830263c4b15847ba87cc9c04366c649c
Reviewed-on: https://review.typo3.org/31449
Reviewed-by: Alexander Schnitzler
Tested-by: Alexander Schnitzler
[TASK] Again fix several issues mentioned in scrutinizer

Releases: 2.0.0
Change-Id: I5790d86ac7936ae6f18807fc8417a892defffa4a
Reviewed-on: https://review.typo3.org/31446
Reviewed-by: Alexander Schnitzler
Tested-by: Alexander Schnitzler