qa: do not error when nothing is available

When there are no source code repositories or CI found in existing
source code repositories or no CI claims to verify, just silentely do
nothing instead of displaying an error.

For a verification to happen, there needs to be at least one source code
repository and at least one CI claim. There may exist CI claims that are
unrelated to source code repositories.

Change-Id: Ic1bbee4f8e76771505aa23debc8bf40a81123216
Signed-off-by: Loic Dachary <loic@dachary.org>