Bug 750625 - Fix Coverity (11055-2) Explicit null dereferenced
    
    https://bugzilla.redhat.com/show_bug.cgi?id=750625
    
    plugins/automember/automember.c (automember_pre_op)
    
    Bug Description: Passing null variable "e" to function
    "automember_parse_config_entry", which dereferences it.
    Missing a check of the NULL possibility of target entry "e" when
    modop is not a supported op type.
    
    Fix Description: If modop is not a supported type, it bails there.