Bugfix selecting guide deviation when guiding is not running
If the option "Only start if Guide Deviation < xy" is set, it should be possible to capture previews without the guider is running. The current implementation is too strict and requires guiding running even for previews.
Additionally, this change contains
- a fix for crash caused when stopping capturing while waiting for the defined guide threshold
- a test case for the recently published fix for capturing dark libraries
Edited by Wolfgang Reissenberger