Handle error

Author: davidsvantesson

routers/repo/issue.go

@@ -606,13 +606,17 @@ func commentTag(repo *models.Repository, poster *models.User, issue *models.Issu
 
 // ViewIssue render issue view page
 func ViewIssue(ctx *context.Context) {
-	if extIssueUnit, _ := ctx.Repo.Repository.GetUnit(models.UnitTypeExternalTracker); extIssueUnit != nil {
+	extIssueUnit, err := ctx.Repo.Repository.GetUnit(models.UnitTypeExternalTracker)
+	if err == nil && extIssueUnit != nil {
 		if extIssueUnit.ExternalTrackerConfig().ExternalTrackerStyle == markup.IssueNameStyleNumeric {
 			metas := ctx.Repo.Repository.ComposeMetas()
 			metas["index"] = ctx.Params(":index")
 			ctx.Redirect(com.Expand(extIssueUnit.ExternalTrackerConfig().ExternalTrackerFormat, metas))
 			return
 		}
+	} else if err != nil && !models.IsErrUnitTypeNotExist(err) {
+		ctx.ServerError("GetUnit", err)
+		return
 	}
 
 	issue, err := models.GetIssueByIndex(ctx.Repo.Repository.ID, ctx.ParamsInt64(":index"))