Site Logo Block: Fix non-admin users seeing zero character (#65010)

Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: akasunil <sunil25393@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>

packages/block-library/src/site-logo/edit.js

@@ -423,7 +423,7 @@ export default function LogoEdit( {
 				context: 'view',
 			} );
 		const _isRequestingMediaItem =
-			_siteLogoId &&
+			!! _siteLogoId &&
 			! select( coreStore ).hasFinishedResolution( 'getMedia', [
 				_siteLogoId,
 				{ context: 'view' },