Fix decoding panic caused by wrong commit

fcharlie · web-flow · commit 6470f91dd8ca · 2024-08-07T13:44:28.000+08:00
eg:

```
tree 2aedfd35087c75d17bdbaf4dd56069d44fc75b71
parent 75158117eb8efe60453f8c077527ac3530c81e38
author Credit Card Account &lt;Credit Card Account&gt; 1722305889 +0800
committer \346\244\260\346\235\215
 &lt;Credit Card Account&gt; 1722305889 +0800

Credit Card Account
```
diff --git a/commit.go b/commit.go
@@ -145,7 +145,7 @@ func (c *Commit) Decode(hash hash.Hash, from io.Reader, size int64) (n int, err
 					c.Committer = ""
 				}
 			default:
-				if strings.HasPrefix(s.Text(), " ") {
+				if strings.HasPrefix(text, " ") && len(c.ExtraHeaders) > 0 {
 					idx := len(c.ExtraHeaders) - 1
 					hdr := c.ExtraHeaders[idx]
 

Original file line number	Diff line number	Diff line change
`@@ -145,7 +145,7 @@ func (c *Commit) Decode(hash hash.Hash, from io.Reader, size int64) (n int, err`
`145`	`145`	`c.Committer = ""`
`146`	`146`	`}`
`147`	`147`	`default:`
`148`		`- if strings.HasPrefix(s.Text(), " ") {`
	`148`	`+ if strings.HasPrefix(text, " ") && len(c.ExtraHeaders) > 0 {`
`149`	`149`	`idx := len(c.ExtraHeaders) - 1`
`150`	`150`	`hdr := c.ExtraHeaders[idx]`
`151`	`151`