[server,bfss] fix storage migration when Bytes attributes is None (closes #13519541)
When a Bytes attributes is None before the BFSS storage migration,
the migration crashes. A Bytes attribute can be None, when the attribute
is not required and there is no default value. In this case, the attributes
should remained None after migration and no file is stored on the disk.
@echo off
rem = """-*-Python-*- script
rem -------------------- DOS section --------------------
rem You could set PYTHONPATH or TK environment variables here
python -x "%~f0" %*
goto exit
"""
# -------------------- Python section --------------------
import sys
from os.path import join, dirname, normpath
sys.path.insert(0, normpath(join(dirname(__file__), '..', '..')))
from cubicweb.cwctl import run
run(sys.argv[1:])
DosExitLabel = """
:exit
rem """