FIX: Don't try to send invite email when invite was deleted

app/jobs/regular/invite_email.rb

@@ -9,6 +9,8 @@ module Jobs
       raise Discourse::InvalidParameters.new(:invite_id) unless args[:invite_id].present?
 
       invite = Invite.find_by(id: args[:invite_id])
+      return unless invite.present?
+
       message = InviteMailer.send_invite(invite)
       Email::Sender.new(message, :invite).send
     end

spec/jobs/invite_email_spec.rb

@@ -20,6 +20,11 @@ describe Jobs::InviteEmail do
         Jobs::InviteEmail.new.execute(invite_id: invite.id)
       end
 
+      it "aborts without error when the invite doesn't exist anymore" do
+        invite.destroy
+        InviteMailer.expects(:send_invite).never
+        Jobs::InviteEmail.new.execute(invite_id: invite.id)
+      end
     end
 
   end