From c6a79f1c10c09abd46f18692cad9126e09a39a59 Mon Sep 17 00:00:00 2001
From: yuvipanda <yuvipanda@gmail.com>
Date: Sun, 30 Jul 2017 05:12:35 -0700
Subject: [PATCH] Don't add packages list if there are no packages

---
 repo2docker/detectors.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/repo2docker/detectors.py b/repo2docker/detectors.py
index daf8e2ae..38b29768 100644
--- a/repo2docker/detectors.py
+++ b/repo2docker/detectors.py
@@ -54,6 +54,7 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
+{% if packages -%}
 RUN apt-get update && \
     apt-get install --yes \
        {% for package in packages -%}
@@ -62,6 +63,7 @@ RUN apt-get update && \
     && apt-get purge && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
+{% endif -%}
 
 EXPOSE 8888