code: function _hasChildren(content) {
      if (!content) return false;
      if (typeof content === 'object') return true;
      if (Array.isArray(content) && content.every(item => typeof item === 'string')) return false;
      return false;
  }
docs: Check is content of bemNode value, or children
  
  @param {Object|Array|String|undefined} content - bemNode content
  @returns {Boolean} is content of bemNode are children
  @private