Problem with list_dependencies tool when asking for project dependency information

[Marko Käning]

Hi,

quite a few times I was hit by the fact that the list_dependencies tool
returns something seemingly valid, even if the project specified doesn’t
exist like here:

---
$ ./list_dependencies kdesupport/prison
kdesupport/extra-cmake-modules
Qt5[stable]
kdesupport/prison

$ ./list_dependencies kdesupport/priso
kdesupport/extra-cmake-modules
Qt5[stable]
kdesupport/priso
---

However, the list_preferred tool does hiccup in such a case:

---
$ ./list_preferred_repo_branch kf5-qt5 kdesupport/prison
frameworks

$ ./list_preferred_repo_branch kf5-qt5 kdesupport/priso
<nothing set> (use master?)
---

Would be cool if that could also be done like that for list_dependencies!

Greets,
Marko