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

* debug empty lines in vault.log

* minor grammar fix

* add changelog

* add fmt changes

changelog/16714.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+debug: Remove extra empty lines from vault.log when debug command is run
+```

command/debug.go

@@ -1080,6 +1080,7 @@ func (c *DebugCommand) writeLogs(ctx context.Context) {
 	for {
 		select {
 		case log := <-logCh:
+			if len(log) > 0 {
 				if !strings.HasSuffix(log, "\n") {
 					log += "\n"
 				}
@@ -1088,6 +1089,7 @@ func (c *DebugCommand) writeLogs(ctx context.Context) {
 					c.captureError("log", err)
 					return
 				}
+			}
 		case <-ctx.Done():
 			return
 		}

website/content/api-docs/system/monitor.mdx

@@ -26,7 +26,7 @@ default, this is text.
 - `log_level` `(string: "info")` – Specifies the log level to use when streaming logs. This defaults to `info`
   if not specified.
 
-- `log_format` `(string: "standard")` – Specifies the log format to emit when streaming logs. Supported values are "standard" and "json". The default is `standard`.
+- `log_format` `(string: "standard")` – Specifies the log format to emit when streaming logs. Supported values are "standard" and "json". The default is `standard`,
 if not specified.
 
 ### Sample Request