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Add explicit error message if e.getMessage is null

In the NetworkingModule, if the http request failed, we send a `didCompleteNetworkResponse` event with the error message, which is used on JS side to determine if the request was erroring. Currently we get the error message from `e.getMessage()`, however, not all exceptions have a message and it might therefore return null and thus resulting in no error on JS side. This change checks if the message is null and if so uses a default message.

In android send a request using XMLHttpRequest with a timeout set to a server that has a delay larger than the timeout (so we force the timeout to happen).

const request =  new XMLHttpRequest();'GET', "http://localhost:3000/", true);
request.timeout = 1000;
request.ontimeout = () => { console.log('ontimeout'); };

See the timeout callback being called correctly.

Fixes #11666
Closes #13407

Differential Revision: D4963764

Pulled By: hramos

fbshipit-source-id: 61ffcef9e0594fe9bface24fdb8bde1e6eec3990
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reneweb authored and facebook-github-bot committed Apr 27, 2017
1 parent 971b083 commit c6614f117f19a2c689e5e606adc10440fe75fb0a
@@ -336,7 +336,10 @@ public void onFailure(Call call, IOException e) {
ResponseUtil.onRequestError(eventEmitter, requestId, e.getMessage(), e);
String errorMessage = e.getMessage() != null
? e.getMessage()
: "Error while executing request: " + e.getClass().getSimpleName();
ResponseUtil.onRequestError(eventEmitter, requestId, errorMessage, e);

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