A [no script] script would be useful for when titles and tracks are completely empty, on purpose. A good example is  by   (https://musicbrainz.org/release/d00a4034-345c-42d8-9a78-1d20244b5674). Otherwise the best option is leaving the Script field blank (which seems wrong as it would imply we don't know the script) or setting it to "Symbols" which isn't entirely accurate.