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Description of problem:
implement IFERROR() function in spreadsheet formulae as defined in:
http://tools.oasis-open.org/issues/browse/OFFICE-3468

there is threefold motivation for it:
  * it's defined in ODF
  * it's much more convenient and error-resistant to write IFERROR(expr;value)
    instead of IF(ISERROR(expr);value;expr)
  * it's extensively uses in documents created in other spreadsheets (Gnumeric,
    MS Excel) and it is a compatibility issue when interoperating with users
    of said programs

Version-Release number of selected component (if applicable):
libreoffice-calc-3.4.5.2-9.el6.x86_64

How reproducible:


Steps to Reproduce:
1. 
2.
3.
  
Actual results:


Expected results:


Additional info:

erack, seeing as you were involved in OFFICE-3468 I presume you know the situation here :-)

This feature request is tracked upstream with https://bugs.freedesktop.org/show_bug.cgi?id=34729, no need to have yet another one in our tracker.