Fix empty response handler

Project: 
http://git-wip-us.apache.org/repos/asf/incubator-milagro-mfa-js-lib/repo
Commit: 
http://git-wip-us.apache.org/repos/asf/incubator-milagro-mfa-js-lib/commit/47feecaf
Tree: 
http://git-wip-us.apache.org/repos/asf/incubator-milagro-mfa-js-lib/tree/47feecaf
Diff: 
http://git-wip-us.apache.org/repos/asf/incubator-milagro-mfa-js-lib/diff/47feecaf

Branch: refs/heads/add-documentation
Commit: 47feecaf10b094182df8c5a2d5ce03a4dee3fdce
Parents: d4defcc
Author: Boyan Bakov <[email protected]>
Authored: Mon Feb 15 15:42:46 2016 +0200
Committer: Boyan Bakov <[email protected]>
Committed: Mon Feb 15 15:42:46 2016 +0200

----------------------------------------------------------------------
 lib/mpin.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/incubator-milagro-mfa-js-lib/blob/47feecaf/lib/mpin.js
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diff --git a/lib/mpin.js b/lib/mpin.js
index 0ae1be3..cebf804 100644
--- a/lib/mpin.js
+++ b/lib/mpin.js
@@ -788,7 +788,7 @@ var mpinjs = (function () {
 
     _request.onreadystatechange = function () {
       if (_request.readyState === 4 && _request.status === 200) {
-        if (_parseJson) {
+        if (_parseJson && _request.responseText) {
           cb(null, JSON.parse(_request.responseText));
         } else {
           cb(null, _request.responseText);

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