[PATCH] XendAPIStore - do not remove non-existent item

[Jim Fehlig <jfehlig@novell.com>]

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If list is searched and item not found, then don't attempt to delete the
item.

I've seen this bug manifest as

xen81:~/bin # xm li
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0  3151    16     r-----   1240.8
pxe                                          3   256     1     -b----     26.4
xen81:~/bin # xm des 3
Error: ('d59cd309-80cd-66b3-d4f3-cff439eadc8a', 'VM_metrics')
Usage: xm destroy <Domain>

Terminate a domain immediately.


I'm not sure why this vm had no metrics object associated with it but
nonetheless I don't think we should be throwing exceptions by removing
non-existent objects from XendAPIStore.

    Signed-off-by: Jim Fehlig <jfehlig@novell.com>


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Index: xen-3.3.1-testing/tools/python/xen/xend/XendAPIStore.py
===================================================================
--- xen-3.3.1-testing.orig/tools/python/xen/xend/XendAPIStore.py
+++ xen-3.3.1-testing/tools/python/xen/xend/XendAPIStore.py
@@ -33,7 +33,8 @@ def register(uuid, type, inst):
 
 def deregister(uuid, type):
     old = get(uuid, type)
-    del __classes[(uuid, type)]
+    if old is not None:
+        del __classes[(uuid, type)]
     return old
 
 def get(uuid, type):

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