[node-patches] Change in ovirt-node[master]: fix NoneType error when switch to performance page

[Gerrit Code Review]

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Change subject: fix NoneType error when switch to performance page
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Patch Set 1: No score

Build Successful 

http://jenkins.ovirt.org/job/ovirt-node-devel-check/851/ : make check-local passed

http://jenkins.ovirt.org/job/node-devel/8/ : SUCCESS

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Gerrit-MessageType: comment
Gerrit-Change-Id: Ib57895ec60bf9fb1eb3891efdcbadef173cb740f
Gerrit-PatchSet: 1
Gerrit-Project: ovirt-node
Gerrit-Branch: master
Gerrit-Owner: hai bo <boh.ricky at gmail.com>
Gerrit-Reviewer: oVirt Jenkins CI Server