Move metadata widget code to metadata/widgets.py.

mayan/apps/metadata/widgets.py

@@ -0,0 +1,14 @@
+from __future__ import unicode_literals
+
+
+def get_metadata_string(document):
+    """
+    Return a formated representation of a document's metadata values
+    """
+    return ', '.join(
+        [
+            '%s - %s' % (
+                document_metadata.metadata_type, document_metadata.value
+            ) for document_metadata in document.metadata.all()
+        ]
+    )