Fix for "obj.hasOwnProperty is not a function"

[mbomb007]

  function copyObj(obj, target, overwrite) {
    if (!target) { target = {}; }
    for (var prop in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, prop) && (overwrite !== false || !Object.prototype.hasOwnProperty.call(target, prop))) {
        target[prop] = obj[prop];
      }
    }
    return target
  }

https://www.drupal.org/project/ckeditor_codemirror/issues/3531472