[version_converter] Automatically Add UUIDs For Document

Adding UUIDs, when converting from odML version 1.0 to 1.1.
If an ID already exists, it stays the same, if it is compatible
with the python uuid types. Otherwise (also if empty) a new ID is
created for the document.

Author: fschrader1992

odml/tools/version_converter.py

@@ -422,6 +422,7 @@ def _check_add_ids(self, tree):
         :return: ElementTree
         """
         root = tree.getroot()
+        self._add_id(root)
         for sec in root.iter("section"):
             self._add_id(sec)
             for prop in sec.iter("property"):

test/test_version_converter.py

@@ -272,6 +272,8 @@ def test_convert_odml_file_section(self):
         conv_doc = vc._convert(vc._parse_xml())
         root = conv_doc.getroot()
 
+        root_id = root.findall("id")
+        self.assertEqual(len(root_id), 1)
         sec = root.findall("section")
         self.assertEqual(len(sec), 2)
 
@@ -541,6 +543,8 @@ def test_convert_odml_file_value(self):
         vc = self.VC(file)
         conv_doc = vc._convert(vc._parse_xml())
         root = conv_doc.getroot()
+        root_id = root.findall("id")
+        self.assertEqual(len(root_id), 1)
         sec = root.find("section")
         self.assertEqual(len(sec), 18)
         self.assertEqual(len(sec.findall("id")), 1)