chore: Fix OpenAI sentry errors (#7687)

- add check for nil condition
- add logs for openAI

enterprise/lib/enterprise/integrations/openai_processor_service.rb

@@ -13,7 +13,7 @@ module Enterprise::Integrations::OpenaiProcessorService
     # To what you ask? Sometimes, the response includes
     # "Labels:" in it's response in some format. This is a hacky way to remove it
     # TODO: Fix with with a better prompt
-    response.gsub(/^(label|labels):/i, '')
+    response.present? ? response.gsub(/^(label|labels):/i, '') : ''
   end
 
   private