From 1b47859d373c27a832ec5339d1c58f7a83318ea9 Mon Sep 17 00:00:00 2001
From: ljf <ljf+git@grimaud.me>
Date: Thu, 16 Sep 2021 03:13:32 +0200
Subject: [PATCH] [fix) Pattern and empty string

---
 src/yunohost/utils/config.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/yunohost/utils/config.py b/src/yunohost/utils/config.py
index 6f3d05622..9a737242c 100644
--- a/src/yunohost/utils/config.py
+++ b/src/yunohost/utils/config.py
@@ -526,7 +526,7 @@ class Question(object):
             raise YunohostValidationError("app_argument_required", name=self.name)
 
         # we have an answer, do some post checks
-        if self.value is not None:
+        if self.value not in [None, ""]:
             if self.choices and self.value not in self.choices:
                 self._raise_invalid_answer()
             if self.pattern and not re.match(self.pattern["regexp"], str(self.value)):