From 786f9b50d2892cf942d1fcaca94fbedf0e00e8a3 Mon Sep 17 00:00:00 2001
From: Tobias Genannt <tobias.genannt@gmail.com>
Date: Thu, 9 Apr 2020 10:26:21 +0200
Subject: [PATCH] Fixes build when DOCKER_FROM is set but empty

The DOCKER_FROM is set to an empty value in the push tests.
This expands the check to catch this test case
---
 build.sh | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/build.sh b/build.sh
index ab29a33..68f2f82 100755
--- a/build.sh
+++ b/build.sh
@@ -156,7 +156,9 @@ fi
 ###
 # Determining the value for DOCKER_FROM
 ###
-DOCKER_FROM="${DOCKER_FROM-python:3.7-alpine}"
+if [ -z "$DOCKER_FROM"]; then
+  DOCKER_FROM="python:3.7-alpine"
+fi
 
 ###
 # Variables for labelling the docker image