From 04f06b69f0e26c66e1452c1d0bc540dbcda0ecdc Mon Sep 17 00:00:00 2001
From: Markus Unterwaditzer <markus@unterwaditzer.net>
Date: Sun, 13 Dec 2015 01:47:48 +0100
Subject: [PATCH] fetchparams: Fail on empty values

See #302
---
 vdirsyncer/cli/fetchparams.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vdirsyncer/cli/fetchparams.py b/vdirsyncer/cli/fetchparams.py
index 9623d7a..59009c9 100644
--- a/vdirsyncer/cli/fetchparams.py
+++ b/vdirsyncer/cli/fetchparams.py
@@ -64,6 +64,10 @@ def _fetch_value(opts, key):
         password_cache[cache_key] = e
         raise
     else:
+        if not rv:
+            raise exceptions.UserError('Empty value for {}, this most likely '
+                                       'indicates an error.'
+                                       .format(key))
         password_cache[cache_key] = rv
         return rv