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Pete Huitsing 191db90345 Prevent null header value from raising exception

Summary:
In the wild, our app will occasionally crash with:
```
Fatal Exception: java.lang.NullPointerException
value == null
```

The stack trace brings it back to `okhttp3.Headers$Builder.checkNameAndValue (Headers.java:316)`:
```
if (value == null) throw new NullPointerException("value == null");
```

In the proposed fix, we simply continue the documented functionality of the `extractHeaders` method by returning "null" for invalid data.
Closes https://github.com/facebook/react-native/pull/10861

Differential Revision: D4178624

Pulled By: ericvicenti

fbshipit-source-id: 632e742196339639cb57ea47f9d0efbf04f090be

2016-11-14 19:43:58 -08:00