Fix getting labels, lists or teams if none are available

pkg/models/label_task.go

@@ -208,6 +208,10 @@ func getLabelsByTaskIDs(s *xorm.Session, opts *LabelByTaskIDsOptions) (ls []*lab
 		return nil, 0, 0, err
 	}
 
+	if len(labels) == 0 {
+		return nil, 0, 0, nil
+	}
+
 	// Get all created by users
 	var userids []int64
 	for _, l := range labels {

pkg/models/list.go

@@ -389,6 +389,10 @@ func getRawListsForUser(s *xorm.Session, opts *listOptions) (lists []*List, resu
 
 // addListDetails adds owner user objects and list tasks to all lists in the slice
 func addListDetails(s *xorm.Session, lists []*List) (err error) {
+	if len(lists) == 0 {
+		return
+	}
+
 	var ownerIDs []int64
 	for _, l := range lists {
 		ownerIDs = append(ownerIDs, l.OwnerID)
@@ -412,6 +416,10 @@ func addListDetails(s *xorm.Session, lists []*List) (err error) {
 		fileIDs = append(fileIDs, l.BackgroundFileID)
 	}
 
+	if len(fileIDs) == 0 {
+		return
+	}
+
 	// Unsplash background file info
 	us := []*UnsplashPhoto{}
 	err = s.In("file_id", fileIDs).Find(&us)

pkg/models/namespace.go

@@ -531,6 +531,14 @@ func (n *Namespace) Delete(s *xorm.Session, a web.Auth) (err error) {
 	if err != nil {
 		return
 	}
+
+	if len(lists) == 0 {
+		return events.Dispatch(&NamespaceDeletedEvent{
+			Namespace: n,
+			Doer:      a,
+		})
+	}
+
 	var listIDs []int64
 	// We need to do that for here because we need the list ids to delete two times:
 	// 1) to delete the lists itself

pkg/models/teams.go

@@ -120,6 +120,11 @@ func GetTeamByID(s *xorm.Session, id int64) (team *Team, err error) {
 }
 
 func addMoreInfoToTeams(s *xorm.Session, teams []*Team) (err error) {
+
+	if len(teams) == 0 {
+		return nil
+	}
+
 	// Put the teams in a map to make assigning more info to it more efficient
 	teamMap := make(map[int64]*Team, len(teams))
 	var teamIDs []int64