[FIX] Binding changingProperty for empty values
[FIX] Binding changingProperty for empty values

* Non-strict equallity check prevented setting some values
* i.e. "" == 0 is true, therefore no change is set

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