Unexpected behaviour when there's only until field in report-config.yaml

[lyuanww]

Please include the steps to reproduce the bug.

1. Add only the until field in your repo settings in report-config.yaml

2. Run Reposense without any CLI flags
3. You will receive an unexpected warning.

What was expected to happen?

Reposense should run without this warning and provide repo info until the date specified by the until field

Additional context

The faulty code is found in setSinceUntilDate in OneStopConfigRunConfiguration.java
When stepping through the code, it is found that while the cli flags is not explicitly provided, there's a cli default since flag which will trigger this piece of code.