[AGIPD][DARK] Avoid failed jobs for creating constants and injecting them

Description

This is a preparation for integrating the calibration for AGIPD single modules.

At the moment dark processing will have only one failed job while creating the dark summary plots.

Now summary plotting is skipped by default for single module detector.

How Has This Been Tested?

Relevant Documents (optional)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

Reviewers

@schmidtp @hammerd