Kevin Gozali 854c2330eb fixed blobmanager inserting nil when there's no mime type
Summary:
Upon handling symbolication response when a redbox occurs, the blob manager inserted `nil` mime type because the response header doesn't specify any. This crashed the app with exception:

```
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[4]'
terminating with uncaught exception of type NSException
```

Reviewed By: shergin

Differential Revision: D6945632

fbshipit-source-id: 9298bd2674447106763c73e1a5035417bd30f29c
2018-02-08 19:31:25 -08:00
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