Prevent PHP fatal on malformed style source with style_loader_src hook (#45621)

Author: tbradsha

projects/plugins/jetpack/changelog/fix-jetpack-fatal_on_style_loader_src_hook

@@ -0,0 +1,4 @@
+Significance: patch
+Type: other
+
+Prevent PHP error when handling malformed style source.

projects/plugins/jetpack/class.jetpack.php

@@ -5122,7 +5122,7 @@ public static function maybe_min_asset( $url, $path, $plugin ) {
 	 * @return mixed
 	 */
 	public static function set_suffix_on_min( $src, $handle ) {
-		if ( ! str_contains( $src, '.min.css' ) ) {
+		if ( ! is_string( $src ) || ! str_contains( $src, '.min.css' ) ) {
 			return $src;
 		}