No error reporting for failed upload of background image in theme customizer

[WPsites]

I tried uploading a background image using the theme cusomizer in 3.5 RC2 but nothing happened. After a few more tries I worked out that there was a problem uploading the file but WordPress didn't inform me of this, which it should.

It was only once I'd looked at the response from async-upload.php that I realised there even was a problem.

filename: "Screen Shot 2012-11-28 at 17.50.55.png"
message: "Unable to create directory wp-content/uploads/2012/11. Is its parent directory writable by the server?"
success: false

Related: #22243

Yes looks like it is related to that. I searched through Trac before posting this but couldn't find anything!

You don't get this message?

Yes, it's sad that there isn't currently an informative message.

Replying to ocean90:

You don't get this message?

Yes, it's sad that there isn't currently an informative message.

This ticket is referring to the customizer, not media (but yes, you're correct).

While this is not so great, it is also not a regression.

Since we don't have any error handling in the customizer at all yet, we need to punt on this.

Separately, informative messages are now fixed in trunk, for media. Woo.

#23288 was marked as a duplicate.