zstadler 2943e9dc8d Avoid grep errors in clean-unnecessary-docker (#1089) ...

When `make clean-unnecessary-docker` is run twice, or when there are no docker images tagges as "<none>", make fails because grep fails:

```
Deleting unnecessary container(s)...
Deleting unnecessary image(s)...
make: *** [Makefile:562: clean-unnecessary-docker] Error 1
```

Using `awk` to _also_ search for "<none>", instead of `grep`, solves this issue.

2021-03-16 17:20:25 +01:00

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