Fixes #4781: Adds Edit + Add Page ScrollToTopPage() On Settings Tab Form Error Messages

[thabaum]

Fixes #4781:

• Adds Edit + Add page ScrollToTopPage() on error messages.

[sbwalker]

@thabaum the page name validation is already handled in the existing code:

There is a required attribute on the field:

<input id="name" class="form-control" @bind="@_name" maxlength="50" required />

and a form validator in the Save method:

if (await interop.FormValid(form))

This handles all of the required fields.

[thabaum]

@sbwalker I guess I was thinking about this error message

'
AddModuleMessage(Localizer["Message.Required.PageInfo"], MessageType.Warning);
if (string.IsNullOrEmpty(_name))
{
AddModuleMessage(Localizer["Message.Required.PageName"], MessageType.Warning);
}
await ScrollToPageTop();
'

Just seemed more friendly to have the error message tell what is the issue instead of looking for a red x in the form for the blank page which I think is the only one you can really mess up beside the effective date on the form.
"You Must Provide Page Name, Theme, and Container"

This message however does not get fired off when the page is blank.

Instead you get this one:
AddModuleMessage(SharedLocalizer["Message.InfoRequired"], MessageType.Warning);
"Please Provide All Required Information"

A more generic message for this error which I understand is probably preffered.

I can remove the message enhancements I suppose it is a bit more simple to keep it just a message that makes a user review the entire form.

[thabaum]

@sbwalker I went ahead and removed the added error message for blank page name. This just focuses on scroll to top of page functionality on error messages.