fix whel delete from db and getting torrent

src/server/torr/apihelper.go

@@ -59,8 +59,9 @@ func GetTorrent(hashHex string) *Torrent {
 		return tor
 	}
 
-	tor = GetTorrentDB(hash)
-
+	tr := GetTorrentDB(hash)
+	if tr != nil {
+		tor = tr
 		go func() {
 			tr, _ := NewTorrent(tor.TorrentSpec, bts)
 			if tr != nil {
@@ -71,6 +72,7 @@ func GetTorrent(hashHex string) *Torrent {
 				tr.GotInfo()
 			}
 		}()
+	}
 	return tor
 }