No need to call the kudos creator if the message list is empty.

Author: ocielliottc

server/src/main/java/com/objectcomputing/checkins/services/slack/kudos/KudosChannelReader.java

@@ -52,6 +52,8 @@ public void readChannel() {
             kudosChannelReadTimeStore.save(new KudosChannelReadTime());
         }
 
-        slackKudosCreator.store(messages);
+        if (!messages.isEmpty()) {
+            slackKudosCreator.store(messages);
+        }
     }
 }