From 4674c057a4877868c48cdb512bdfbd622e879df8 Mon Sep 17 00:00:00 2001
From: Tom Staubitz <thomas.staubitz@hpi.uni-potsdam.de>
Date: Wed, 18 Jan 2017 11:10:34 +0100
Subject: [PATCH] Fixed rejection of untagged images

---
 lib/docker_client.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/docker_client.rb b/lib/docker_client.rb
index a8bdf915..28e2a3fb 100644
--- a/lib/docker_client.rb
+++ b/lib/docker_client.rb
@@ -325,7 +325,7 @@ class DockerClient
   end
 
   def self.image_tags
-    Docker::Image.all.map { |image| image.info['RepoTags'] }.flatten.reject { |tag| tag.present? && tag.include?('<none>') }
+    Docker::Image.all.map { |image| image.info['RepoTags'] }.flatten.reject { |tag| tag.nil? || tag.include?('<none>') }
   end
 
   def initialize(options = {})