Initialise CONFIG['sso_auth'] to an empty hash

An empty hash can be iterated, but a false value (unset) cannot be.
Even though we no longer iterate this hash in the initialiser, we
do so elsewhere in the code.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

src/api/config/initializers/omniauth.rb

@@ -2,15 +2,15 @@ OmniAuth.config.path_prefix = '/user/sso'
 
 path = Rails.root.join("config", "auth.yml")
 
+CONFIG['sso_auth'] = Hash.new
+
 if File.exist? path
   begin
       CONFIG['sso_auth'] = YAML.load_file(path)
   rescue Exception
       puts "Error while parsing config file #{path}"
-      CONFIG['sso_auth'] = Hash.new
   end
 
-  if CONFIG['sso_auth']
   Rails.application.config.middleware.use OmniAuth::Builder do
       CONFIG['sso_auth'].each do |name, options|
           options[:name] = name
@@ -18,4 +18,3 @@ if File.exist? path
       end
   end
 end
-end