Don't let users try to submit a news if there is no section

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
     annotate (2.4.0)
     arel (2.0.9)
     autotest-standalone (4.5.5)
-    babosa (0.3.3)
+    babosa (0.3.4)
     bcrypt-ruby (2.1.4)
     bitfields (0.3.0)
     builder (2.1.2)
@@ -99,8 +99,8 @@ GEM
     jammit (0.6.0)
       closure-compiler (>= 0.1.0)
       yui-compressor (>= 0.9.1)
-    jquery-rails (1.0)
-      rails (~> 3.0)
+    jquery-rails (1.0.1)
+      railties (~> 3.0)
       thor (~> 0.14)
     kaminari (0.12.4)
       rails (>= 3.0.0)
@@ -151,20 +151,20 @@ GEM
     rake (0.8.7)
     redcarpet (1.13.1)
     redis (2.2.0)
-    rspec (2.5.0)
-      rspec-core (~> 2.5.0)
-      rspec-expectations (~> 2.5.0)
-      rspec-mocks (~> 2.5.0)
-    rspec-core (2.5.2)
-    rspec-expectations (2.5.0)
+    rspec (2.6.0)
+      rspec-core (~> 2.6.0)
+      rspec-expectations (~> 2.6.0)
+      rspec-mocks (~> 2.6.0)
+    rspec-core (2.6.0)
+    rspec-expectations (2.6.0)
       diff-lcs (~> 1.1.2)
     rspec-instafail (0.1.7)
-    rspec-mocks (2.5.0)
-    rspec-rails (2.5.0)
+    rspec-mocks (2.6.0)
+    rspec-rails (2.6.0)
       actionpack (~> 3.0)
       activesupport (~> 3.0)
       railties (~> 3.0)
-      rspec (~> 2.5.0)
+      rspec (~> 2.6.0)
     sanitize (2.0.1)
       nokogiri (~> 1.4.4)
     sass (3.1.1)

app/controllers/news_controller.rb

@@ -26,6 +26,7 @@ def show
   end
 
   def new
+    redirect_to root_url, :alert => "Désolé, il n'est pas possible de proposer une dépêche en l'absence de sections" if Section.blank?
     @news = News.new
   end