Remove extra empty lines from vault.log - Debug command (#16714)

* debug empty lines in vault.log

* minor grammar fix

* add changelog

* add fmt changes

command/debug.go

@@ -1080,13 +1080,15 @@ func (c *DebugCommand) writeLogs(ctx context.Context) {
 	for {
 		select {
 		case log := <-logCh:
-			if !strings.HasSuffix(log, "\n") {
-				log += "\n"
-			}
-			_, err = out.WriteString(log)
-			if err != nil {
-				c.captureError("log", err)
-				return
+			if len(log) > 0 {
+				if !strings.HasSuffix(log, "\n") {
+					log += "\n"
+				}
+				_, err = out.WriteString(log)
+				if err != nil {
+					c.captureError("log", err)
+					return
+				}
 			}
 		case <-ctx.Done():
 			return