fix: handle named sharding in enr (#2647)

waku/factory/internal_config.nim

@@ -36,6 +36,8 @@ proc enrConfiguration*(
       let shardsRes = topicsToRelayShards(conf.pubsubTopics)
       if shardsRes.isOk() and shardsRes.get().isSome():
         shardsLocal = shardsRes.get().get().shardIds
+      elif not shardsRes.get().isNone():
+        info "no pubsub topics specified or pubsubtopic is of type Named sharding "
       else:
         error "failed to parse pubsub topic, please format according to static shard specification",
           error = shardsRes.error