Reraise errors unless response is defined and present

Author: rgould

lib/ruby_odata/service.rb

@@ -374,7 +374,7 @@ def handle_collection_result(result)
 
   # Handles errors from the OData service
   def handle_exception(e)
-    raise e unless defined? e.response
+    raise e unless defined?(e.response) && e.response != nil
 
     code = e.response[:status]
     error = Nokogiri::XML(e.response[:body])