replace Exception with WP_Error error handling in 2 places.
PHP Docblock
Merge branch 'master' into use-wp-error-292

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replace more exceptions
replace last Exception
fixes unmatched closing parenthesis and docblock
only show addon sentence part when service is active
Merge pull request #292 from humanmade/use-wp-error-292

Replace exceptions with WP_Error
Merge pull request #326 from humanmade/sched-sentence-325

only show addon sentence part when service is active
excludes backupbuddy default folder