fix(projects): do not return parent project id when authenticating as link share

Related to https://community.vikunja.io/t/vikunja-freezes/2246
Related to https://github.com/go-vikunja/vikunja/issues/233

pkg/models/project.go

@@ -146,6 +146,9 @@ func (p *Project) ReadAll(s *xorm.Session, a web.Auth, search string, page int,
 		}
 		projects := []*Project{project}
 		err = addProjectDetails(s, projects, a)
+		if err == nil && len(projects) > 0 {
+			projects[0].ParentProjectID = 0
+		}
 		return projects, 0, 0, err
 	}
 
@@ -226,6 +229,11 @@ func (p *Project) ReadOne(s *xorm.Session, a web.Auth) (err error) {
 		p.OwnerID = sf.OwnerID
 	}
 
+	_, isShareAuth := a.(*LinkSharing)
+	if isShareAuth {
+		p.ParentProjectID = 0
+	}
+
 	// Get project owner
 	p.Owner, err = user.GetUserByID(s, p.OwnerID)
 	if err != nil {