function isEmptyCropzone(cropRect) {
  const { left, top, width, height } = cropRect;
  const { LEFT, TOP, WIDTH, HEIGHT } = emptyCropRectValues;

  return left === LEFT && top === TOP && width === WIDTH && height === HEIGHT;
}
Check if cropRect is Empty.
@param {Object} cropRect - cropRect object
 @param {Number} cropRect.left - cropRect left position value
 @param {Number} cropRect.top - cropRect top position value
 @param {Number} cropRect.width - cropRect width value
 @param {Number} cropRect.height - cropRect height value
@returns {boolean}