Format an input tag list (either comma-delimited or an array) as an output array with blanks and whitespace removed

reformat_tags.js

function reformatTags(tags) {
  var _tags = (tags || '').toString().trim().replace(/\s*,\s*/g, ',').replace(/^,|,$/g, '').split(',');
  if (_tags[0] === '' && _tags.length === 1) _tags = [];  // hack for empty form submissions
  return _tags;
};