Fix uncategorized pattern browsing when pattern has no categories (#6…

…6945)


Co-authored-by: matiasbenedetto <mmaattiiaass@git.wordpress.org>
Co-authored-by: ramonjd <ramonopoly@git.wordpress.org>
Co-authored-by: Mamaduka <mamaduka@git.wordpress.org>
Co-authored-by: getdave <get_dave@git.wordpress.org>

packages/block-editor/src/components/inserter/block-patterns-explorer/pattern-list.js

@@ -85,10 +85,10 @@ function PatternList( {
 				return true;
 			}
 			if ( selectedCategory === 'uncategorized' ) {
-				const hasKnownCategory = pattern.categories.some(
-					( category ) =>
+				const hasKnownCategory =
+					pattern.categories?.some( ( category ) =>
 						registeredPatternCategories.includes( category )
-				);
+					) ?? false;
 
 				return ! pattern.categories?.length || ! hasKnownCategory;
 			}