From 31aa7e168285ccc8178be81c5ec3fb1007e3d0b5 Mon Sep 17 00:00:00 2001
From: Tomas Tomecek <ttomecek@redhat.com>
Date: Aug 05 2016 13:13:52 +0000
Subject: let xmd be None or dict


spec says it can be None:
    A dictionary of user-defined keys and values.  May be null.

Signed-off-by: Tomas Tomecek <ttomecek@redhat.com>

---

diff --git a/modulemd/__init__.py b/modulemd/__init__.py
index f0ce750..a9d1f10 100644
--- a/modulemd/__init__.py
+++ b/modulemd/__init__.py
@@ -299,8 +299,10 @@ class ModuleMetadata(object):
             raise TypeError("documentation must be a string")
         if not isinstance(self.tracker, str):
             raise TypeError("tracker must be a string")
-        if not isinstance(self.xmd, dict):
-            raise TypeError("xmd must be a dictionary")
+        if self.xmd is not None and not isinstance(self.xmd, dict):
+            raise TypeError(
+                "xmd must be a dictionary or null, current value: {!r}".format(self.xmd)
+            )
         if not isinstance(self.profiles, dict):
             raise TypeError("profiles must be a dictionary")
         for p in self.profiles.keys():