Andrew Kryczka c2f6e45aa3 prevent nullptr dereference in table reader error case
Summary:
A user encountered segfault on the call to `CacheDependencies()`, probably because `NewIndexIterator()` failed before populating `*index_entry`. Let's avoid the call in that case.
Closes https://github.com/facebook/rocksdb/pull/2939

Differential Revision: D5928611

Pulled By: ajkr

fbshipit-source-id: 484be453dbb00e5e160e9c6a1bc933df7d80f574
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