Do not show sections selection if there is only one section in Blogs module.

System version 0.422
modules:
Blogs 0.077
Comments 0.022
Cron 0.008
Deferred tasks 0.1.2+build-5
Disqus 1.0.1+build-2
Feedback 0.006
HybridAuth 2.1.1-cs37
OAuth2 0.031
Photo_gallery 0.019
Plupload 2.0.0-cs2
Static_pages 0.038
plugins:
Admin_default_theme 0.005
Fotorama 4.4.8-cs1
SimpleImage 2.4.0-cs1
TinyMCE 4.0.11-cs1