exclude test-team members without gitlab user-name entry

In the current test-team list there are two entries without a gitlab user-name.

running the latest ttq from master gives the following output for exmple for the ppp:

$ ./ttq.py pinephonepro                                                                                                                    
---                                                                                                                                                           |
Please try this out once CI passes! Testing instructions can be found [here](https://wiki.postmarketos.org/wiki/Testing_Team#How_to_test_changes?). Testing is
 done using the [mrtest](https://wiki.postmarketos.org/wiki/Mrtest) tool.                                                                                     
* pine64-pinephonepro (@, @Breakfastisready, @Weissnix4711, @fossdd, @panzersajt)
-----------------------^

This is a bit confusing and could be improved!

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