Fix flake8 errors: W504 line break after binary operator
Fix flake8 errors: W504 line break after binary operator

jnns/wagtail,jnns/wagtail,mikedingjan/wagtail,mixxorz/wagtail,FlipperPA/wagtail,torchbox/wagtail,timorieber/wagtail,nealtodd/wagtail,nimasmi/wagtail,nealtodd/wagtail,zerolab/wagtail,torchbox/wagtail,zerolab/wagtail,nealtodd/wagtail,takeflight/wagtail,wagtail/wagtail,rsalmaso/wagtail,gasman/wagtail,torchbox/wagtail,mixxorz/wagtail,mixxorz/wagtail,timorieber/wagtail,nealtodd/wagtail,jnns/wagtail,gasman/wagtail,jnns/wagtail,zerolab/wagtail,rsalmaso/wagtail,mikedingjan/wagtail,zerolab/wagtail,kaedroho/wagtail,mikedingjan/wagtail,takeflight/wagtail,FlipperPA/wagtail,kaedroho/wagtail,thenewguy/wagtail,timorieber/wagtail,gasman/wagtail,thenewguy/wagtail,rsalmaso/wagtail,gasman/wagtail,FlipperPA/wagtail,mixxorz/wagtail,nimasmi/wagtail,nimasmi/wagtail,kaedroho/wagtail,kaedroho/wagtail,takeflight/wagtail,wagtail/wagtail,takeflight/wagtail,zerolab/wagtail,mikedingjan/wagtail,torchbox/wagtail,timorieber/wagtail,nimasmi/wagtail,wagtail/wagtail,kaedroho/wagtail,gasman/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,thenewguy/wagtail,wagtail/wagtail,wagtail/wagtail,thenewguy/wagtail,FlipperPA/wagtail,mixxorz/wagtail,thenewguy/wagtail