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[f16-branch] Fix traceback when installing over a system with broken rpm db.



It presented itself as "TypeError: expected string or buffer".

Resolves: rhbz#728883
---
 pyanaconda/storage/__init__.py |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/pyanaconda/storage/__init__.py b/pyanaconda/storage/__init__.py
index abfdb55..00ec25d 100644
--- a/pyanaconda/storage/__init__.py
+++ b/pyanaconda/storage/__init__.py
@@ -1521,6 +1521,10 @@ def findExistingRootDevices(anaconda, upgradeany=False):
                 # This likely isn't our product, so don't even count it as
                 # notUpgradable.
                 continue
+            if arch is None:
+                # we failed to determine the arch (for instance when there is a
+                # corrupted rpm database on the target system)
+                continue
 
             if upgradeany or \
                anaconda.instClass.productUpgradable(arch, product, version):
-- 
1.7.6


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