Special-casing the zero glyph page is unnecessary (Part 2)
<rdar://problem/112344047>
Pull request: https://github.com/WebKit/WebKit/pull/15873
Committed 266091@main (68a63d5baeaf): <https://commits.webkit.org/266091@main> Reviewed commits have been landed. Closing PR #15873 and removing active labels.