Fix #703: Recover from empty structure files in PDB_CACHE_DIR#774

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sbliven merged 11 commits intobiojava:bugfixes-4.2from

Jun 18, 2018

Commits on Jun 4, 2018

Commits on Jun 12, 2018

Incorporating suggestions from @josemduarte
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Commits on Jun 14, 2018

Commits on Jun 15, 2018

Fix test failure due to PDB change
sbliven
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Commits on Jun 18, 2018

Revert fix for mmcif files without auth_seq_id column
sbliven
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