Hide header and footer in AssetLib when not necessary

Reduces visual clutter by hiding pages navigator header and footer in AssetLib if no results are
found or when results fit on one page one page.

Fix for issue #23036

editor/plugins/asset_library_editor_plugin.cpp

@@ -962,6 +962,9 @@ HBoxContainer *EditorAssetLibrary::_make_pages(int p_page, int p_page_count, int
 
 	HBoxContainer *hbc = memnew(HBoxContainer);
 
+	if (p_page_count < 2)
+		return hbc;
+
 	//do the mario
 	int from = p_page - 5;
 	if (from < 0)