only warn logger if present

lib/paper_trail/record_trail.rb

@@ -505,7 +505,7 @@ module PaperTrail
       version.logger.warn(
         "Unable to create version for #{action} of #{@record.class.name}" +
           "##{@record.id}: " + version.errors.full_messages.join(", ")
-      )
+      ) if version.logger
     end
 
     # Returns true if the given HABTM association should be saved.

lib/paper_trail/reifier.rb

@@ -179,7 +179,7 @@ module PaperTrail
             model[k.to_sym] = v
           elsif model.respond_to?("#{k}=")
             model.send("#{k}=", v)
-          else
+          elsif version.logger
             version.logger.warn(
               "Attribute #{k} does not exist on #{version.item_type} (Version id: #{version.id})."
             )