[FIX] Key error when there are no SMTP env. vars
[FIX] Key error when there are no SMTP env. vars

cateee/fosdem-volunteers,cateee/fosdem-volunteers,jrial/fosdem-volunteers,jrial/fosdem-volunteers,FOSDEM/volunteers,jrial/fosdem-volunteers,FOSDEM/volunteers,jrial/fosdem-volunteers,cateee/fosdem-volunteers,FOSDEM/volunteers,FOSDEM/volunteers,cateee/fosdem-volunteers