Deleting incorrect reference to NcProcModels (Fix Collab unit tests)

[phstratmann]

Objective of pull request: Re-enabling unit tests in Collab (Parallelization PR), which were broken as the ReadGateCModel no longer exists.

Please check your PR type:

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] Documentation changes
• [ ] Other (please describe):