ariaLabelHasValue = (prop) => {
  const value = getPropValue(prop);
  if (value === undefined) {
    return false;
  }
  if (typeof value === 'string' && value.length === 0) {
    return false;
  }
  return true;
}
@fileoverview Enforce all elements that require alternative text have it.
@author Ethan Cohen