More detailed error output.

git-svn-id: https://plugins.svn.wordpress.org/campaign-monitor-synchronization/trunk@887971 b8457f37-d9ea-0310-8a92-e5e31aec5664
1.0.9

git-svn-id: https://plugins.svn.wordpress.org/campaign-monitor-synchronization/trunk@887974 b8457f37-d9ea-0310-8a92-e5e31aec5664