[REVIEW 3-6][REVIEW 3-6-0] prevent crash in malformed pivot table loaded from .xls

[Eike Rathke]

Hi,

Please review and cherry-pick to 3-6 and 3-6-0
http://cgit.freedesktop.org/libreoffice/core/commit/?id=3536fcd999f16525f20a1fff5c2512b565511d7b

Fixes a crash when loading a .xls containing a malformed pivot table.
Unfortunately I can't provide a testcase document to reproduce this.

Thanks
  Eike

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