[FIX] Do not send [''] inner error if it's null
[FIX] Do not send [''] inner error if it's null

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