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http://issues.apache.org/bugzilla/show_bug.cgi?id=36164

           Summary: Empty merge expression gives internal server error
           Product: Slide
           Version: 2.1
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Search
        AssignedTo: slide-dev@jakarta.apache.org
        ReportedBy: [EMAIL PROTECTED]


If a dasl query just consists of an empty merge expression, like <d:or/>, slide
will respond with 500 because the expression generated will be null and cause a
NPE in the BasicQueryImpl, line 134.
This is a very easy fix, for both slide 2.1 and trunk:
On line 208 (trunk) or 206 (2.1) of BasicExpressionCompiler, if the
mergeExpression is null, then throw a BadQueryException("OR and AND cannot be
empty!").

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