Merge pull request #188 from olleolleolle/avoid-warning-in-base-strategy

Avoid warning on uninitialized instance variable

lib/warden/strategies/base.rb

@@ -45,6 +45,7 @@ def initialize(env, scope=nil) # :nodoc:
         @env, @scope = env, scope
         @status, @headers = nil, {}
         @halted, @performed = false, false
+        @result = nil
       end
 
       # The method that is called from above. This method calls the underlying authenticate! method