Merge branch 'yandex_rebiling' into 'dev'

finance email

See merge request !310

finance/models.py

@@ -62,6 +62,10 @@ class Invoice(models.Model):
     rebilling_on = models.BooleanField(verbose_name='Повторять платеж', default=False, editable=False)
     rebilling = models.BooleanField(verbose_name='Повторный платеж', default=False, editable=False)
 
+    def get_comment(self):
+        return '''Вам выставлен счёт,''' if \
+            self.comment == "" else self.comment
+
     def __str__(self):
         return '%s:%s %s' % (self.id, self.get_status_display(), self.bill.user)