From 53cccaf1d7e24983eb8e376785d7c0b938293c0f Mon Sep 17 00:00:00 2001
From: Andre Anjos <andre.dos.anjos@gmail.com>
Date: Thu, 8 Oct 2020 15:49:20 +0200
Subject: [PATCH] [build] Fix bug on existing package error report

---
 bob/devtools/build.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/bob/devtools/build.py b/bob/devtools/build.py
index 9c6f0a53..de2c378b 100644
--- a/bob/devtools/build.py
+++ b/bob/devtools/build.py
@@ -611,10 +611,11 @@ def base_build(
         return
 
     if any(urls):
+        use_urls = [k for k in urls if k]
         raise RuntimeError(
             "One or more packages for recipe at '%s' already exist (%s). "
             "Change the package build number to trigger a build."
-            % (recipe_dir, ", ".join(urls)),
+            % (recipe_dir, ", ".join(use_urls)),
         )
 
     # if you get to this point, just builds the package(s)
-- 
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