[svn:fx-trunk] 5884: Defend ButtonBar from null DataProvider

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revision: 5884
author: aharui@adobe.com
date: 2009-04-02 12:41:42 -0700 (thu, 02 apr 2009)

log message:
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defend buttonbar null dataprovider

qe notes: none
doc notes: none
bugs: sdk-20448
reviewer: alex
tests: checkintests, mustella/gumbo/buttonbar

ticket links:
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http://bugs.adobe.com/jira/browse/sdk-20448

modified paths:
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flex/sdk/trunk/frameworks/projects/flex4/src/spark/components/buttonbar.as



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