Added basic error logging in osync_member_support_targetformat()
Added basic error logging in osync_member_support_targetformat()

osync_member_support_targetformat() seems to have a large enough call
tree that this is useful... plus, some functions that it calls end up
reporting bothersome (nil) errors in some cases if there is no error
object available to report to.

luizluca/opensync-luizluca,luizluca/opensync-luizluca