Explicitly check for get_url_parts returning None
Explicitly check for get_url_parts returning None

This ensures that unrelated TypeErrors don't get buried.

FlipperPA/wagtail,mixxorz/wagtail,wagtail/wagtail,nilnvoid/wagtail,quru/wagtail,timorieber/wagtail,nimasmi/wagtail,thenewguy/wagtail,gasman/wagtail,torchbox/wagtail,davecranwell/wagtail,wagtail/wagtail,iansprice/wagtail,rsalmaso/wagtail,takeflight/wagtail,takeflight/wagtail,jnns/wagtail,mikedingjan/wagtail,zerolab/wagtail,torchbox/wagtail,Toshakins/wagtail,torchbox/wagtail,torchbox/wagtail,mixxorz/wagtail,gasman/wagtail,thenewguy/wagtail,zerolab/wagtail,chrxr/wagtail,Toshakins/wagtail,nutztherookie/wagtail,jnns/wagtail,davecranwell/wagtail,wagtail/wagtail,wagtail/wagtail,nilnvoid/wagtail,hamsterbacke23/wagtail,rsalmaso/wagtail,mixxorz/wagtail,quru/wagtail,davecranwell/wagtail,chrxr/wagtail,nutztherookie/wagtail,timorieber/wagtail,kaedroho/wagtail,nilnvoid/wagtail,rsalmaso/wagtail,nealtodd/wagtail,hamsterbacke23/wagtail,nealtodd/wagtail,chrxr/wagtail,rsalmaso/wagtail,mikedingjan/wagtail,kurtw/wagtail,hamsterbacke23/wagtail,kurtrwall/wagtail,zerolab/wagtail,nimasmi/wagtail,kurtw/wagtail,mixxorz/wagtail,FlipperPA/wagtail,zerolab/wagtail,thenewguy/wagtail,FlipperPA/wagtail,Toshakins/wagtail,mixxorz/wagtail,nimasmi/wagtail,zerolab/wagtail,kaedroho/wagtail,thenewguy/wagtail,iansprice/wagtail,takeflight/wagtail,gasman/wagtail,rsalmaso/wagtail,hamsterbacke23/wagtail,iansprice/wagtail,Toshakins/wagtail,kurtrwall/wagtail,davecranwell/wagtail,nilnvoid/wagtail,mikedingjan/wagtail,gogobook/wagtail,nutztherookie/wagtail,nealtodd/wagtail,kurtw/wagtail,chrxr/wagtail,quru/wagtail,jnns/wagtail,takeflight/wagtail,kurtw/wagtail,timorieber/wagtail,quru/wagtail,gasman/wagtail,jnns/wagtail,gogobook/wagtail,gogobook/wagtail,mikedingjan/wagtail,timorieber/wagtail,kaedroho/wagtail,kaedroho/wagtail,nealtodd/wagtail,kurtrwall/wagtail,iansprice/wagtail,kaedroho/wagtail,gasman/wagtail,wagtail/wagtail,nutztherookie/wagtail,thenewguy/wagtail,kurtrwall/wagtail,gogobook/wagtail,nimasmi/wagtail,FlipperPA/wagtail