Fix nested structures in NcStream #1196
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Description of Changes
If data had a structure within a structure, the inner structure's members wouldn't get set when read with the NcStreamReader (used by CdmRemote). This caused TDS integration test
thredds.server.cdmr.TestCdmRemoteCompareDataP.doOne[/share/testdata/cdmUnitTest/thredds-test-data/local/thredds-test-data/cdmUnitTest/formats/netcdf4/testNestedStructure.nc]to fail with a nullptr exception. With this fix all the CdmRemote tests pass. There aren't any netcdf-java unit tests hitting this code as far as I could tell, but I ran the netcdf-java tests on Jenkins on this branch just in case.
PR Checklist
until ready for review