fix dfget panic

yunfeiyanggzq · yunfeiyanggzq · commit 3b2743fc89bb · 2019-09-14T13:47:17.000+08:00
Signed-off-by: yunfeiyangbuaa &lt;yunfeiyang@buaa.edu.cn&gt;
diff --git a/dfget/core/core.go b/dfget/core/core.go
@@ -299,7 +299,7 @@ func reportMetrics(cfg *config.Config, supernodeAPI api.SupernodeAPI, downloadTi
 		if err != nil {
 			logrus.Errorf("failed to report metrics to supernode %s: %v", node, err)
 		}
-		if resp.IsSuccess() {
+		if resp != nil && resp.IsSuccess() {
 			return
 		}
 	}

Original file line number	Diff line number	Diff line change
`@@ -299,7 +299,7 @@ func reportMetrics(cfg *config.Config, supernodeAPI api.SupernodeAPI, downloadTi`
`299`	`299`	`if err != nil {`
`300`	`300`	`logrus.Errorf("failed to report metrics to supernode %s: %v", node, err)`
`301`	`301`	`}`
`302`		`- if resp.IsSuccess() {`
	`302`	`+ if resp != nil && resp.IsSuccess() {`
`303`	`303`	`return`
`304`	`304`	`}`
`305`	`305`	`}`