Show explicit error message when the scm command failed (eg. when svn binary is not available).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1094 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/application.rb

@@ -137,6 +137,11 @@ class ApplicationController < ActionController::Base
     return false
   end
   
+  def render_error(msg)
+    flash.now[:error] = msg
+    render :nothing => true, :layout => !request.xhr?, :status => 500
+  end
+  
   def render_feed(items, options={})    
     @items = items || []
     @items.sort! {|x,y| y.event_datetime <=> x.event_datetime }