Help Articles require an External URL - They should not :)

When entering a help article, the user must enter an external URL in order to Save the article, this should not be the case, the External URL is optional.

Steps:

1. Login
2. Navigate to Administration > Help Articles
3. Add a new article, do NOT enter an External URL
4. 
5. Click on Save

• Actual result
  • Nothing Happens
  • emlah log

  • System.NullReferenceException: URL cannot be null.
       at Mx.Web.UI.Config.WebApi.RESTController.ThrowExceptionIfParameterIsNullOrZeroOrEmpty(Object value, String parameterName)
       at Mx.Web.UI.Areas.Administration.Help.Api.HelpArticleController.PutHelpArticle(HelpArticle helpArticle)
       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClassc.<GetExecutor>b__6(Object instance, Object[] methodParameters)
       at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)
    --- End of stack trace from previous location where exception was thrown ---
    

• Expected result
• Help article is saved

• Verification of error
• Enter External URL
• 
• Toast message received

I have also verified this in JAT - Staging and Prod work without the external URL