Fixed an exception when nil fields are sent to the exporter#98

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Motti-Shneor wants to merge 1 commit intodavedelong:masterfrom Motti-Shneor:nil_field_fix

+2-2

Commits on Jan 13, 2016

Fixed a crushing (exception) bug when nil fields were sent to the exporter.
Motti-Shneor
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