404 Page

[ramzan]

Before rendering the page, check if the item exists. If it doesn't, show a 404 page instead.

Fixes #3

[tasn]

Looks great, thanks a lot!

Just one stylistic comment: in EteSync we always have multilines ifs, so:

if (this.itemUndefined(itemUid)) {return PageNotFound()}

should be:

if (this.itemUndefined(itemUid)) {
  return PageNotFound();
}

Fix this, and it can be merged.

Great job, and thanks again!

[tasn]

Didn't mean to close it :facepalm:

[ramzan]

Fixed.