Fixed bug in DTEDRasterReader where AVList was assumed non-null#7

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mikeoertli wants to merge 4 commits intoNASAWorldWind:masterfrom

mikeoertli:master

Commits on Apr 21, 2016

In DTEDRasterReader added check for null AVList before trying to use it, if null create a new empty AVListImpl.
Mike Oertli
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Commits on Aug 15, 2016

Removed AVList instantiation, changed null check on params
Mike Oertli
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Revert "Removed AVList instantiation, changed null check on params"
Mike Oertli
committed
Changed null check for params to simplify, removed AVList instantiation.
mikeoertli
committed