make the check_old_style_urlconf not crash and burn if wagtailimages_serve has not been added to urls.py
make the check_old_style_urlconf not crash and burn if wagtailimages_serve has not been added to urls.py

mjec/wagtail,m-sanders/wagtail,jorge-marques/wagtail,gasman/wagtail,rv816/wagtail,wagtail/wagtail,nutztherookie/wagtail,kurtw/wagtail,nealtodd/wagtail,iansprice/wagtail,Pennebaker/wagtail,davecranwell/wagtail,gogobook/wagtail,Klaudit/wagtail,bjesus/wagtail,stevenewey/wagtail,marctc/wagtail,zerolab/wagtail,kaedroho/wagtail,quru/wagtail,benjaoming/wagtail,JoshBarr/wagtail,takeflight/wagtail,kaedroho/wagtail,nilnvoid/wagtail,hamsterbacke23/wagtail,thenewguy/wagtail,zerolab/wagtail,benemery/wagtail,torchbox/wagtail,hanpama/wagtail,gogobook/wagtail,zerolab/wagtail,m-sanders/wagtail,mixxorz/wagtail,mixxorz/wagtail,serzans/wagtail,thenewguy/wagtail,jorge-marques/wagtail,rsalmaso/wagtail,WQuanfeng/wagtail,mikedingjan/wagtail,mephizzle/wagtail,nimasmi/wagtail,stevenewey/wagtail,nilnvoid/wagtail,FlipperPA/wagtail,wagtail/wagtail,mephizzle/wagtail,timorieber/wagtail,serzans/wagtail,chrxr/wagtail,kurtw/wagtail,jorge-marques/wagtail,bjesus/wagtail,jorge-marques/wagtail,gasman/wagtail,KimGlazebrook/wagtail-experiment,m-sanders/wagtail,dresiu/wagtail,dresiu/wagtail,rv816/wagtail,rjsproxy/wagtail,nrsimha/wagtail,willcodefortea/wagtail,inonit/wagtail,darith27/wagtail,marctc/wagtail,Tivix/wagtail,chimeno/wagtail,kaedroho/wagtail,Toshakins/wagtail,inonit/wagtail,nutztherookie/wagtail,FlipperPA/wagtail,zerolab/wagtail,takeflight/wagtail,rsalmaso/wagtail,jorge-marques/wagtail,benjaoming/wagtail,bjesus/wagtail,KimGlazebrook/wagtail-experiment,wagtail/wagtail,jnns/wagtail,janusnic/wagtail,WQuanfeng/wagtail,Pennebaker/wagtail,serzans/wagtail,taedori81/wagtail,iho/wagtail,gasman/wagtail,mixxorz/wagtail,kurtrwall/wagtail,nrsimha/wagtail,Klaudit/wagtail,takeshineshiro/wagtail,jnns/wagtail,dresiu/wagtail,mjec/wagtail,willcodefortea/wagtail,KimGlazebrook/wagtail-experiment,wagtail/wagtail,Toshakins/wagtail,rv816/wagtail,nrsimha/wagtail,tangentlabs/wagtail,nealtodd/wagtail,quru/wagtail,thenewguy/wagtail,mikedingjan/wagtail,quru/wagtail,timorieber/wagtail,torchbox/wagtail,rjsproxy/wagtail,torchbox/wagtail,thenewguy/wagtail,Toshakins/wagtail,mikedingjan/wagtail,taedori81/wagtail,mayapurmedia/wagtail,willcodefortea/wagtail,kurtw/wagtail,rsalmaso/wagtail,takeflight/wagtail,stevenewey/wagtail,hamsterbacke23/wagtail,Tivix/wagtail,Pennebaker/wagtail,tangentlabs/wagtail,mjec/wagtail,iho/wagtail,benemery/wagtail,gogobook/wagtail,FlipperPA/wagtail,kurtrwall/wagtail,darith27/wagtail,m-sanders/wagtail,darith27/wagtail,chimeno/wagtail,marctc/wagtail,FlipperPA/wagtail,mixxorz/wagtail,taedori81/wagtail,mjec/wagtail,tangentlabs/wagtail,benemery/wagtail,kaedroho/wagtail,davecranwell/wagtail,Klaudit/wagtail,rv816/wagtail,janusnic/wagtail,iansprice/wagtail,nrsimha/wagtail,bjesus/wagtail,hanpama/wagtail,stevenewey/wagtail,JoshBarr/wagtail,mayapurmedia/wagtail,JoshBarr/wagtail,benjaoming/wagtail,nutztherookie/wagtail,jnns/wagtail,kurtrwall/wagtail,chimeno/wagtail,nimasmi/wagtail,janusnic/wagtail,mixxorz/wagtail,marctc/wagtail,iansprice/wagtail,timorieber/wagtail,chrxr/wagtail,Klaudit/wagtail,rjsproxy/wagtail,dresiu/wagtail,rsalmaso/wagtail,janusnic/wagtail,quru/wagtail,dresiu/wagtail,KimGlazebrook/wagtail-experiment,hanpama/wagtail,serzans/wagtail,davecranwell/wagtail,thenewguy/wagtail,timorieber/wagtail,takeshineshiro/wagtail,zerolab/wagtail,chrxr/wagtail,WQuanfeng/wagtail,iho/wagtail,JoshBarr/wagtail,willcodefortea/wagtail,taedori81/wagtail,mayapurmedia/wagtail,WQuanfeng/wagtail,wagtail/wagtail,jordij/wagtail,inonit/wagtail,benemery/wagtail,nilnvoid/wagtail,jnns/wagtail,gasman/wagtail,chrxr/wagtail,kurtrwall/wagtail,gasman/wagtail,iansprice/wagtail,jordij/wagtail,hamsterbacke23/wagtail,davecranwell/wagtail,Tivix/wagtail,iho/wagtail,Tivix/wagtail,nealtodd/wagtail,nimasmi/wagtail,jordij/wagtail,torchbox/wagtail,takeshineshiro/wagtail,hanpama/wagtail,mayapurmedia/wagtail,mephizzle/wagtail,hamsterbacke23/wagtail,jordij/wagtail,Pennebaker/wagtail,taedori81/wagtail,nimasmi/wagtail,nilnvoid/wagtail,gogobook/wagtail,nealtodd/wagtail,rjsproxy/wagtail,mephizzle/wagtail,tangentlabs/wagtail,Toshakins/wagtail,takeflight/wagtail,chimeno/wagtail,kurtw/wagtail,takeshineshiro/wagtail,nutztherookie/wagtail,rsalmaso/wagtail,mikedingjan/wagtail,inonit/wagtail,chimeno/wagtail,kaedroho/wagtail,benjaoming/wagtail,darith27/wagtail