docker-puppet: skip empty volume entries

This allows to optionally add volumes, where we could use a heat
conditional to either put the volume path we want or put an empty string
which should be safely skipped.

Change-Id: I68f91ffdd8ceb14735adad1322fcf124c47b160c

diff --git a/docker/docker-puppet.py b/docker/docker-puppet.py
index 0f07943..8f95208 100755 (executable)
--- a/docker/docker-puppet.py
+++ b/docker/docker-puppet.py
@@ -205,7 +205,8 @@ def mp_puppet_config((config_volume, puppet_tags, manifest, config_image, volume
                 '--volume', '%s:%s:rw' % (sh_script, sh_script) ]
 
         for volume in volumes:
-            dcmd.extend(['--volume', volume])
+            if volume:
+                dcmd.extend(['--volume', volume])
 
         dcmd.extend(['--entrypoint', sh_script])