Keep the logger on a disabled bridge. Fixes #1616 (#1621)

bridge/matrix/matrix.go

@@ -301,6 +301,9 @@ func (b *Bmatrix) handlematrix() {
 	syncer.OnEventType("m.room.member", b.handleMemberChange)
 	go func() {
 		for {
+			if b == nil {
+				return
+			}
 			if err := b.mc.Sync(); err != nil {
 				b.Log.Println("Sync() returned ", err)
 			}

gateway/router.go

@@ -110,7 +110,9 @@ func (r *Router) disableBridge(br *bridge.Bridge, err error) bool {
 	if r.BridgeValues().General.IgnoreFailureOnStart {
 		r.logger.Error(err)
 		// setting this bridge empty
-		*br = bridge.Bridge{}
+		*br = bridge.Bridge{
+			Log: br.Log,
+		}
 		return true
 	}
 	return false