InCell: fix NPE when parsing Z positions

See QA 7987 and
http://www.openmicroscopy.org/community/viewtopic.php?f=4&t=7474
Merge pull request #994 from melissalinkert/rebased/develop/incell-npe

InCell: fix NPE when parsing Z positions (rebased onto develop)
Update develop submodules

Repository: openmicroscopy/bioformats
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