[PATCH] empty versions shouldn't traceback (#843346)

[Jesse Keating]

This is related to commit 43715e5db831893edcfc2b289a1e575b0ba19403
---
 pyanaconda/installclasses/rhel.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pyanaconda/installclasses/rhel.py b/pyanaconda/installclasses/rhel.py
index 036d84b..c0d8b06 100644
--- a/pyanaconda/installclasses/rhel.py
+++ b/pyanaconda/installclasses/rhel.py
@@ -104,6 +104,9 @@ class InstallClass(BaseInstallClass):
         return False

def versionMatches(self, oldver):
+        if oldver is None:
+            return False
+
         oldMajor = oldver.split(".")[0]
         newMajor = productVersion.split(".")[0]