https://bz.apache.org/bugzilla/show_bug.cgi?id=64393

            Bug ID: 64393
           Summary: [PATCH] Corrects relational operators against
                    MissingArgEval
           Product: POI
           Version: 4.1.2-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: SS Common
          Assignee: dev@poi.apache.org
          Reporter: jwh...@venacorp.com
  Target Milestone: ---

Created attachment 37204
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=37204&action=edit
Patch to treat MissingArgEval like BlankEval in RelationalOperationEval

I investigated an issue with a formula in the form of:

  =ISERROR(C4,)=0

where the expected value is TRUE when C4 is an error. Further investigation
showed that wherever ISERROR had no second argument, Excel treated it like a
zero when comparing against other numbers. This patch modifies
RelationalOperationEval to treat MissingArgEval the same way it treats
BlankEval.

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