More user-friendly error handling in admin/create_web

app/controllers/admin_controller.rb

@@ -30,8 +30,14 @@ class AdminController < ApplicationController
     if @params['address']
       # form submitted
       if @wiki.authenticate(@params['system_password'])
+        begin
           @wiki.create_web(@params['name'], @params['address'])
-        redirect_show('HomePage', @params['address'])
+          flash[:info] = "New web '#{@params['name']}' successfully created."
+          redirect_to :web => @params['address'], :controller => 'wiki', :action => 'new', 
+              :id => 'HomePage'
+        rescue Instiki::ValidationError => e
+          flash[:error] = e.message
+        end
       else 
         redirect_to :controller => 'wiki', :action => 'index'
       end