Siqi Liu 6fb110e776 Add nullcheck in ExceptionsManager.js to Never Update JS Exception with a Null Stack
Summary:
JS codes sometimes report exceptions with `null` details about stack traces, resulting in native `NullPointerException` crashes when parsing the stack traces.
Added null checking for the stack traces in `ExceptionsManager.js`, ensuring that we never call `updateExceptionMessage` with a null stack

Reviewed By: foghina

Differential Revision: D3455783

fbshipit-source-id: 027969afd8a5d6015e97fce0a26626730cfc83a4
2016-06-28 09:43:23 -07:00
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