adding pmdynaform lib folder

thirdparty/jsmin/jsmin.php

@@ -220,6 +220,10 @@ class JSMin {
    * @return bool
    */
   protected function isAlphaNum($c) {
+    // Check if $c is null or not a string
+    if (!is_string($c) || strlen($c) === 0) {
+      return false; // Return false if $c is not a valid character
+    }
     return ord($c) > 126 || $c === '\\' || preg_match('/^[\w\$]$/', $c) === 1;
   }