Merge branch '11-0-newsletter-gerer-l-enregistrement-d-objet-de-mail-vide' into 'dev'

Resolve "[0] [Newsletter] Gérer l'enregistrement d'objet de mail vide"

See merge request !57

internal/models/monthlyReport.go

@@ -85,7 +85,7 @@ func (dh *DataHandler) getMonthlyReport(year int, month int) (monthlyReport Mont
 
 	var mailSubject MailSubject
 	err = dh.sqlClient.Where("year = ? AND month = ?", year, month).First(&mailSubject).Error
-	if err != nil {
+	if err != nil || mailSubject.Subject == "" {
 		// Build default object
 		mailSubject.Subject = fmt.Sprintf("[Ecolyo] Votre bilan %s %v", getMonthNameWithPrep(month-1), year)
 	}