TypeError when comparing partial and full version

[Thyrst]

From changelog under the 2.7.0 release:
Backwards compatibility has been kept

However there is a breaking change that prevents me from upgrading to a new version. This example behaves same for both 2.7.0 and the latest 2.8.4 version.

>>> version_1 = Version("8.0", partial=True)
>>> version_2 = Version("8.0.0")
>>> version_1 > version_2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/thyrst/Temp/env/lib/python3.6/site-packages/semantic_version/base.py", line 463, in __gt__
    return self.precedence_key > other.precedence_key
TypeError: '>' not supported between instances of 'NoneType' and 'int'
>>> version_1 >= version_2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/thyrst/Temp/env/lib/python3.6/site-packages/semantic_version/base.py", line 468, in __ge__
    return self.precedence_key >= other.precedence_key
TypeError: '>=' not supported between instances of 'NoneType' and 'int'
>>> version_1 == version_2
False

In the 2.6.0 version:

>>> version_1 = Version("8.0", partial=True)
>>> version_2 = Version("8.0.0")
>>> version_1 > version_2
False
>>> version_1 >= version_2
True
>>> version_1 == version_2
True

There should be a warning about this change in the changelog.

Instead of the TypeError I would expect just False.