Tweak modeladmin edithandler tests to bind model first
Tweak modeladmin edithandler tests to bind model first

rsalmaso/wagtail,wagtail/wagtail,zerolab/wagtail,thenewguy/wagtail,wagtail/wagtail,thenewguy/wagtail,thenewguy/wagtail,wagtail/wagtail,thenewguy/wagtail,wagtail/wagtail,thenewguy/wagtail,rsalmaso/wagtail,rsalmaso/wagtail,zerolab/wagtail,rsalmaso/wagtail,zerolab/wagtail,zerolab/wagtail,zerolab/wagtail,wagtail/wagtail,rsalmaso/wagtail