Details
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    Type:Bug 
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    Status: Done/Fixed
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    Priority:Trivial 
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    Resolution: Fixed/Completed
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    Affects Version/s: 4.6
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    Component/s: None
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    Labels:
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        Documentation Required?:None
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        Funding Source:Core Team Funds
Description
As reported here: http://civicrm.stackexchange.com/questions/2169/how-to-find-contacts-with-no-group
Search builder crashes when using IS NULL operator with groups.
Further testing showed problems with the NOT IN operator as well as NOT NULL, EMPTY, & NOT EMPTY.