Fix a KeyError when using custom (non-django) fields
Fix a KeyError when using custom (non-django) fields

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