fix data override on torrent edit via web

server/torr/apihelper.go

@@ -136,14 +136,18 @@ func SetTorrent(hashHex, title, poster, category string, data string) *Torrent {
 		torr.Title = title
 		torr.Poster = poster
 		torr.Category = category
-		torr.Data = data
+		if data != "" {
+			torr.Data = data
+		}
 	}
 
 	if torrDb != nil {
 		torrDb.Title = title
 		torrDb.Poster = poster
 		torrDb.Category = category
-		torrDb.Data = data
+		if data != "" {
+			torrDb.Data = data
+		}
 		AddTorrentDB(torrDb)
 	}
 	if torr != nil {

server/torr/dbwrapper.go

@@ -4,10 +4,9 @@ import (
 	"encoding/json"
 	"time"
 
-	"server/torr/utils"
-
 	"server/settings"
 	"server/torr/state"
+	"server/torr/utils"
 
 	"github.com/anacrolix/torrent/metainfo"
 )
@@ -26,9 +25,11 @@ func AddTorrentDB(torr *Torrent) {
 	if torr.Data == "" {
 		files := new(tsFiles)
 		files.TorrServer.Files = torr.Status().FileStats
-		buf, _ := json.Marshal(files)
-		t.Data = string(buf)
-		torr.Data = t.Data
+		buf, err := json.Marshal(files)
+		if err == nil {
+			t.Data = string(buf)
+			torr.Data = t.Data
+		}
 	} else {
 		t.Data = torr.Data
 	}
@@ -51,11 +52,11 @@ func GetTorrentDB(hash metainfo.Hash) *Torrent {
 			torr.TorrentSpec = db.TorrentSpec
 			torr.Title = db.Title
 			torr.Poster = db.Poster
+			torr.Category = db.Category
 			torr.Timestamp = db.Timestamp
 			torr.Size = db.Size
 			torr.Data = db.Data
 			torr.Stat = state.TorrentInDB
-			torr.Category = db.Category
 			return torr
 		}
 	}
@@ -74,9 +75,9 @@ func ListTorrentsDB() map[metainfo.Hash]*Torrent {
 		torr.TorrentSpec = db.TorrentSpec
 		torr.Title = db.Title
 		torr.Poster = db.Poster
+		torr.Category = db.Category
 		torr.Timestamp = db.Timestamp
 		torr.Size = db.Size
-		torr.Category = db.Category
 		torr.Data = db.Data
 		torr.Stat = state.TorrentInDB
 		ret[torr.TorrentSpec.InfoHash] = torr