Added check_field_is_empty decorator to cleaning.py. This makes sure the cleaning checks are skipped when a field is empty. Note that Djanog will raise it's own ValidationError when a required field is empty before attempting to clean it. Patch by: Lennard de Rijk Reviewed by: to-be-reviewed.

from django.db.backends import BaseDatabaseClient
from django.conf import settings
import os

class DatabaseClient(BaseDatabaseClient):
    executable_name = 'sqlite3'

    def runshell(self):
        args = ['', settings.DATABASE_NAME]
        os.execvp(self.executable_name, args)