Minor validation errors in admin bar

[araucaria]

Several elements in the admin bar have unwanted white space at the start of the class attribute:

<ul id="wp-admin-bar-appearance" class=" ab-submenu">

and

<li id="wp-admin-bar-search" class=" admin-bar-search">

[MattyRob]

I've confirmed this with trunk code at rev 20826.

I've played about with the class-wp-admin-bar.php file and I think I've got a fix too.

[MattyRob]

Ternary operator fix

[nacin]

While both patches probably work, we can make the intent a bit clearer. Try 20698.2.diff​. (And when in doubt, a trim() can sweep most awkward logic branches under the rug.)

[nacin]

In [21193]:

Don't output empty class names or ones with leading/trailing spaces. props MattyRob for the initial patch. fixes #20698.