[FIX] Contribution getting default time
[FIX] Contribution getting default time

- Closes #955.

mic4ael/indico,indico/indico,pferreir/indico,DirkHoffmann/indico,ThiefMaster/indico,mvidalgarcia/indico,DirkHoffmann/indico,indico/indico,pferreir/indico,ThiefMaster/indico,indico/indico,OmeGak/indico,indico/indico,DirkHoffmann/indico,OmeGak/indico,mic4ael/indico,ThiefMaster/indico,mvidalgarcia/indico,pferreir/indico,DirkHoffmann/indico,mic4ael/indico,OmeGak/indico,mvidalgarcia/indico,mvidalgarcia/indico,pferreir/indico,ThiefMaster/indico,mic4ael/indico,OmeGak/indico