Update mr_upgrade.py (#1334)
Update mr_upgrade.py (#1334)

Fixing bug if the sqlite database is not defined in `.env` then default to the default database location.
gmarnin/munkireport-php,munkireport/munkireport-php,gmarnin/munkireport-php,gmarnin/munkireport-php,munkireport/munkireport-php,n8felton/munkireport-php,munkireport/munkireport-php,gmarnin/munkireport-php,gmarnin/munkireport-php,n8felton/munkireport-php,n8felton/munkireport-php,n8felton/munkireport-php,n8felton/munkireport-php,munkireport/munkireport-php,n8felton/munkireport-php,munkireport/munkireport-php