Don't fail if there is no system library list

[sergiusens]

LP: #1577750

Signed-off-by: Sergio Schvezov sergio.schvezov@ubuntu.com

[kyrofa]

This looks good to me, though I'm trying to decide the use-case for this. Specifically, if someone is building a snap targeting a release that doesn't exist, it's not going to work, right? Why plow ahead and build that snap instead of erroring out? Maybe my complaint is more with the bug: it doesn't really describe why what's happening right now is a problem.

[kyrofa]

Oh, because it's coming from the running system, I see. But shouldn't it use an exclusion list based on the target environment rather than the host? Which is still 16.04?

[sergiusens]

@kyrofa if it is of any use although you seem to have figured it out https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-yakkety/yakkety/amd64/s/snapcraft/20160503_064449@/log.gz :-)

[kyrofa]

Alright, combined with discussion on IRC, 👍 .