Skip over empty (cf_null) list entries in maplist.

Fixes Redmine #6576, includes acceptance test.
Redmine 6225: Disable examples checking on non-Linux platforms.
Merge pull request #1985 from kacfengine/examples_test

Redmine 6225: Disable examples checking on non-Linux platforms.
Update acceptance test status for Solaris platforms.
Merge pull request #1982 from vohi/redmine/6576

Skip over empty (cf_null) list entries in maplist.