Form Validation/Error Handling

[percworld]

[x] form validation - look forward to learning more about this. In working with error handling in async js, attempts at validating have each caused unforeseen behavior that needs to be researched. This issue is considered resolved to disabling the post and showing the user that fields need to be filled before submission.
scripts.js line 157 catchData() has been changed to checkUserData() line 137
[x] displayError handler for catches - function checkForError in PostData.js - after many considerations this is being marked as resolved by experience and not implementation. Utilizing this in a then statement and containing the .json call on a response was switched back to including the .json separate for each fetch in it's own .then statement.