add respond_to? in order to log any exception (#238)

Author: nicolascochin

app/controllers/avo/application_controller.rb

@@ -18,7 +18,7 @@ def exception_logger(exception)
       respond_to do |format|
         format.html { raise exception }
         format.json { render json: {
-          errors: exception.record.present? ? exception.record.errors : [],
+          errors: exception.respond_to?(:record) && exception.record.present? ? exception.record.errors : [],
           message: exception.message,
           traces: exception.backtrace,
         }, status: ActionDispatch::ExceptionWrapper.status_code_for_exception(exception.class.name) }