method called on null $backdrop reference

Created by: wesreid

With options { backdrop: false }, this.$backdrop.remove() is still being called which results in an exception as this.$backdrop is null.


    hideModal: function () {
        var that = this
        this.$element.hide()
        this.backdrop(function () {
          that.removeBackdrop()
          that.$element.trigger('hidden')
        })
      }

removeBackdrop: function () {
        this.$backdrop.remove()
        this.$backdrop = null
  }