Apply review suggestions from @nilsding

Co-authored-by: Georg Gadinger <nilsding@nilsding.org>

app/workers/share_worker.rb

@@ -16,19 +16,15 @@ class ShareWorker
   rescue ActiveRecord::RecordNotFound
     logger.info "Tried to post answer ##{answer_id} for user ##{user_id} to #{service.titleize} but the user/answer/service did not exist (likely deleted), will not retry."
     # The question to be posted was deleted
-    nil
   rescue Twitter::Error::DuplicateStatus
     logger.info "Tried to post answer ##{answer_id} from user ##{user_id} to Twitter but the status was already posted."
-    nil
   rescue Twitter::Error::Forbidden
     # User's Twitter account is suspended
     logger.info "Tried to post answer ##{answer_id} from user ##{user_id} to Twitter but the account is suspended."
-    nil
   rescue Twitter::Error::Unauthorized
     # User's Twitter token has expired or been revoked
     # TODO: Notify user if this happens (https://github.com/Retrospring/retrospring/issues/123)
     logger.info "Tried to post answer ##{answer_id} from user ##{user_id} to Twitter but the token has exired or been revoked."
-    nil
   rescue => e
     logger.info "failed to post answer #{answer_id} to #{service} for user #{user_id}: #{e.message}"
     Sentry.capture_exception(e)