move deliver email under completed_at touch, to avoid email to brake since the completead_at would be nil
move deliver email under completed_at touch, to avoid email to brake since the completead_at would be nil

Fixes #4363

Hates/spree,bjornlinder/Spree,Hates/spree,bjornlinder/Spree,Hates/spree,Hates/spree,bjornlinder/Spree