Christoph Jerolimov c449d9e72d Fix an issue (Sticky header index was outside the range) when renderSeparator is defined but returns null
Summary:Fix an issue when using ListView and define `renderSeparator` but the implementation returns null.

In such cases the sectionHeaderIndices mismatch the child element index and the app shows a warning like "Sticky header index 18 was outside the range {0, 13}".
Closes https://github.com/facebook/react-native/pull/5800

Differential Revision: D2980005

Pulled By: vjeux

fb-gh-sync-id: cd2d51d83698ed189bb65ea40b7b073644136b49
shipit-source-id: cd2d51d83698ed189bb65ea40b7b073644136b49
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