Fix nil pointer on instance-wide actor lookup

Ref T820

activitypub.go

@@ -45,12 +45,14 @@ const (
 
 var instanceColl *Collection
 
-func initActivityPub(cfg *config.Config) {
-	ur, _ := url.Parse(cfg.App.Host)
+func initActivityPub(app *App) {
+	ur, _ := url.Parse(app.cfg.App.Host)
 	instanceColl = &Collection{
-		ID:    0,
-		Alias: ur.Host,
-		Title: ur.Host,
+		ID:       0,
+		Alias:    ur.Host,
+		Title:    ur.Host,
+		db:       app.db,
+		hostName: app.cfg.App.Host,
 	}
 }
 

app.go

@@ -384,13 +384,13 @@ func Initialize(apper Apper, debug bool) (*App, error) {
 
 	apper.App().InitDecoder()
 
-	apper.App().InitActivityPub()
-
 	err = ConnectToDatabase(apper.App())
 	if err != nil {
 		return nil, fmt.Errorf("connect to DB: %s", err)
 	}
 
+	initActivityPub(apper.App())
+
 	// Handle local timeline, if enabled
 	if apper.App().cfg.App.LocalTimeline {
 		log.Info("Initializing local timeline...")
@@ -501,10 +501,6 @@ func (app *App) InitDecoder() {
 	app.formDecoder.RegisterConverter(sql.NullFloat64{}, converter.ConvertSQLNullFloat64)
 }
 
-func (app *App) InitActivityPub() {
-	initActivityPub(app.cfg)
-}
-
 // ConnectToDatabase validates and connects to the configured database, then
 // tests the connection.
 func ConnectToDatabase(app *App) error {