Update Coordinator client, add datagram assembly.

logdog/client/cmd/logdog_cat/subcommandQuery.go

Index: logdog/client/cmd/logdog_cat/subcommandQuery.go
diff --git a/logdog/client/cmd/logdog_cat/subcommandQuery.go b/logdog/client/cmd/logdog_cat/subcommandQuery.go
index 6a6f36d5806d4e8b968158f31687b6bf256ec9b7..11f2b6af90c191647e4b4197342c9b89ba2c8920 100644
--- a/logdog/client/cmd/logdog_cat/subcommandQuery.go
+++ b/logdog/client/cmd/logdog_cat/subcommandQuery.go
@@ -222,16 +222,14 @@ func (p *jsonQueryOutput) emit(s *coordinator.LogStream) error {
 		Project: string(s.Project),
 		Path:    string(s.Path),
 	}
-	if s.State != nil {
-		o.Created = clockflag.Time(s.State.Created)
-		o.Updated = clockflag.Time(s.State.Updated)
-		o.TerminalIndex = int64(s.State.TerminalIndex)
-		o.ArchiveIndexURL = s.State.ArchiveIndexURL
-		o.ArchiveStreamURL = s.State.ArchiveStreamURL
-		o.ArchiveDataURL = s.State.ArchiveDataURL
-		o.Purged = s.State.Purged
-		o.Descriptor = s.Desc
-	}
+	o.Created = clockflag.Time(s.State.Created)
+	o.Updated = clockflag.Time(s.State.Updated)
+	o.TerminalIndex = int64(s.State.TerminalIndex)
+	o.ArchiveIndexURL = s.State.ArchiveIndexURL
+	o.ArchiveStreamURL = s.State.ArchiveStreamURL
+	o.ArchiveDataURL = s.State.ArchiveDataURL
+	o.Purged = s.State.Purged
+	o.Descriptor = &s.Desc
 
 	if p.enc == nil {
 		p.enc = json.NewEncoder(p)