stdlib: Fix CustomResource metadata

CustomResource's base class, AbstractResource, must be constructed with
a dictionary for the 'metadata' field. However, if the user did not
specify any metadata for the CustomResource, None is passed. This is
not permitted and can cause error. This patch ensures the metadata is
set to an empty dictionary by default

Change-Id: I358725ee6982dc9c6410eac3ad8194fa676dd326
Reviewed-by: Jason Lowe-Power <>
Maintainer: Jason Lowe-Power <>
Tested-by: kokoro <>
1 file changed