cubicweb #3732012 [migration] harmless crash at migration end [open]

Traceback (most recent call last):
File "/home/auc/confs/pegase/cubicweb/cwctl.py", line 162, in run_arg
status = cmdmeth(appid)
File "/home/auc/confs/pegase/cubicweb/cwctl.py", line 795, in upgrade_instance
helper.postupgrade(repo)
File "/home/auc/confs/pegase/cubicweb/web/webctl.py", line 115, in postupgrade
self.generate_static_dir(config, ask_clean=True, repo=repo)
File "/home/auc/confs/pegase/cubicweb/web/webctl.py", line 89, in generate_static_dir
copy(osp.join(resource_dir, resource_path), dest_resource)
File "/usr/lib/python2.7/posixpath.py", line 75, in join
if b.startswith('/'):
AttributeError: 'NoneType' object has no attribute 'startswith'
instance pegase not upgraded: 'NoneType' object has no attribute 'startswith'

prioritynormal
typebug
done in<not specified>
closed by<not specified>