THX38 does not check theme support for current theme

[MikeHansenMe]

I have been working on a theme that happens to not have a widget area. I went to look into what the widget screen would look like and was happy that the menu for widgets did not show at all. When using the new theme screen I clicked the current theme and noticed 3 buttons near the bottom(Customize, Menu, and Widgets). We need to check current theme support before showing buttons.

[MikeHansenMe]

check for theme support

[MikeHansenMe]

missing space :)

[ocean90]

In 26335:

Appearance Themes: Don't show theme actions if the current theme doesn't support menus or widgets.

props MikeHansenMe.
fixes #25949.

[dimadin]

There is a space missing after if, and I believe that according to new coding standards if PHP and HTML are mixed we should use colon and endif instead of braces.

[bpetty]

In general, endif-style conditionals are still allowed when breaking into HTML, however, the coding standards don't require it.