Subject: Do not compare between None and int
From: Radostin Stoyanov rstoyanov1@gmail.com Wed Oct 11 12:35:54 2017 +0100
Date: Fri Oct 20 13:18:31 2017 -0400:
Git: a2bcd6c43a77b03693d11d231e8c0a7b0609889b

In Python 2 comparison between int and None is allowed but in
Pyhton 3 it is not.

Example:

Pyhton 2

    >>> None > 0
    False

Python 3

    >>> None > 0
    Traceback (most recent call last):
      File "<stdin>", line 1, in <module>
    TypeError: '>' not supported between instances of 'NoneType' and 'int'

diff --git a/tests/utils.py b/tests/utils.py
index 7397d369..e9072bf4 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -181,7 +181,7 @@ def diff_compare(actual_out, filename=None, expect_out=None):
 
     diff = "".join(difflib.unified_diff(expect_out.splitlines(1),
                                         actual_out.splitlines(1),
-                                        fromfile=filename,
+                                        fromfile=filename or '',
                                         tofile="Generated Output"))
     if diff:
         raise AssertionError("Conversion outputs did not match.\n%s" % diff)
diff --git a/virtinst/support.py b/virtinst/support.py
index 19160fba..6b0489a5 100644
--- a/virtinst/support.py
+++ b/virtinst/support.py
@@ -187,7 +187,8 @@ class _SupportCheck(object):
         actual_hv_version = conn.conn_version()
 
         # Check that local libvirt version is sufficient
-        if _version_str_to_int(self.version) > actual_libvirt_version:
+        v = _version_str_to_int(self.version)
+        if v and (v > actual_libvirt_version):
             return False
 
         if self.hv_version: