Fix restore without topic failure (go-gitea#18387)

lunny · zeripath · web-flow · commit a717265e477a · 2022-01-25T10:44:12.000+08:00
Co-authored-by: zeripath &lt;art27@cantab.net&gt;
diff --git a/services/migrations/restore.go b/services/migrations/restore.go
@@ -97,6 +97,9 @@ func (r *RepositoryRestorer) GetTopics() ([]string, error) {
 
 	bs, err := os.ReadFile(p)
 	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
 		return nil, err
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -97,6 +97,9 @@ func (r *RepositoryRestorer) GetTopics() ([]string, error) {`
`97`	`97`
`98`	`98`	`bs, err := os.ReadFile(p)`
`99`	`99`	`if err != nil {`
	`100`	`+ if os.IsNotExist(err) {`
	`101`	`+ return nil, nil`
	`102`	`+ }`
`100`	`103`	`return nil, err`
`101`	`104`	`}`
`102`	`105`