Fix `EmailsOnPushWorker` spec
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gitlab-ce/master
is red because of this spec:
1) EmailsOnPushWorker#perform when there are multiple recipients only generates the mail once
Failure/Error: expect(Premailer::Rails::CustomizedPremailer).to receive(:new).once.and_call_original
(Premailer::Rails::CustomizedPremailer (class)).new(*(any args))
expected: 1 time with any arguments
received: 0 times with any arguments
# ./spec/workers/emails_on_push_worker_spec.rb:66:in `block (4 levels) in <top (required)>'