[CLI] Fix pretty-lookup.py so that it does not fail for lookup
[CLI] Fix pretty-lookup.py so that it does not fail for lookup

Right now `pretty-lookup.py` will fail if the JSON key
`availableVersions` is not present. The key is not present for the
`lookup` REST endpoint data returned, but available for the
'reports/gav' REST endpoint data returned.

This commit attempts to conditionally add the `availableVersions` to the
output if present.

project-ncl/dependency-analysis,janinko/dependency-analysis,project-ncl/dependency-analysis,project-ncl/dependency-analysis,janinko/dependency-analysis,janinko/dependency-analysis,janinko/dependency-analysis,janinko/dependency-analysis