Fix some bugs when updating unique fields
Fix some bugs when updating unique fields

chargrizzle/djangae,grzes/djangae,pablorecio/djangae,jscissr/djangae,wangjun/djangae,jscissr/djangae,chargrizzle/djangae,grzes/djangae,kirberich/djangae,wangjun/djangae,trik/djangae,potatolondon/djangae,armirusco/djangae,trik/djangae,armirusco/djangae,kirberich/djangae,SiPiggles/djangae,kirberich/djangae,leekchan/djangae,jscissr/djangae,asendecka/djangae,armirusco/djangae,pablorecio/djangae,leekchan/djangae,potatolondon/djangae,wangjun/djangae,chargrizzle/djangae,pablorecio/djangae,asendecka/djangae,nealedj/djangae,SiPiggles/djangae,b-cannon/my_djae,stucox/djangae,stucox/djangae,martinogden/djangae,SiPiggles/djangae,martinogden/djangae,stucox/djangae,asendecka/djangae,nealedj/djangae,martinogden/djangae,leekchan/djangae,grzes/djangae,trik/djangae,nealedj/djangae