getMatrix return null value

The current master version of getMatrix return matrix which has null value. For the npm version it works fine(all the value are numeric). This is the code:

```
var locations = [
[13.414649963378906, 52.522905940278065],
[13.363409042358397, 52.549218541178455],
[13.394737243652344, 52.55062769982075],
[13.426065444946289, 52.54640008814808],
[13.375682830810547, 52.536534077147714],
[13.39010238647461, 52.546191306649376],
[13.351736068725584, 52.50754964045259],
[13.418254852294922, 52.52927670688215]
];

matrixService.getMatrix({
points: locations.map(function(coord) {
return { coordinates: [coord[0], coord[1]] };
}),
profile: profile
})
.send()
.then(function(response: any) {
// if (response.statusCode !== 200) {
// console.error("MbxClient::getMatrix Error: " + response.statusCode);
// return;
// }

const results: any = response.body;
console.log("MbxClient::getMatrix response.body" + JSON.stringify(results));
});
```
Based on above locations, the response is:
```
[0,null,null,null,24256.1,null,null,19851.3,null,24256.1,24256.1,null,null,null,24256.1,null,null,17502,null,null,null,null,null,null,24256.1
[null,0,41531.5,41531.5,null,43190.2,41531.5,null,7451.1,null,null,7451.1,6595.2,41531.5,null,7451.1,41625.9,null,41531.5,41531.5,41531.5,41531.5,7451.1,41531.5,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[24252,null,null,null,0,null,null,4404.8,null,0,0,null,null,null,0,null,null,6754.1,null,null,null,null,null,null,0
[null,43182.2,4115.5,4115.5,null,0,4115.5,null,39094.3,null,null,39094.3,38238.4,4115.5,null,39094.3,3767.3,null,4115.5,4115.5,4115.5,4115.5,39094.3,4115.5,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[19847.2,null,null,null,4404.8,null,null,0,null,4404.8,4404.8,null,null,null,4404.8,null,null,2349.3,null,null,null,null,null,null,4404.8
[null,7544.9,37597.4,37597.4,null,39256.1,37597.4,null,0,null,null,0,1831.7,37597.4,null,0,37691.8,null,37597.4,37597.4,37597.4,37597.4,0,37597.4,null
[24252,null,null,null,0,null,null,4404.8,null,0,0,null,null,null,0,null,null,6754.1,null,null,null,null,null,null,0
[24252,null,null,null,0,null,null,4404.8,null,0,0,null,null,null,0,null,null,6754.1,null,null,null,null,null,null,0
[null,7544.9,37597.4,37597.4,null,39256.1,37597.4,null,0,null,null,0,1831.7,37597.4,null,0,37691.8,null,37597.4,37597.4,37597.4,37597.4,0,37597.4,null
[null,6651.4,36703.9,36703.9,null,38362.6,36703.9,null,1790.1,null,null,1790.1,0,36703.9,null,1790.1,36798.3,null,36703.9,36703.9,36703.9,36703.9,1790.1,36703.9,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[24252,null,null,null,0,null,null,4404.8,null,0,0,null,null,null,0,null,null,6754.1,null,null,null,null,null,null,0
[null,7544.9,37597.4,37597.4,null,39256.1,37597.4,null,0,null,null,0,1831.7,37597.4,null,0,37691.8,null,37597.4,37597.4,37597.4,37597.4,0,37597.4,null
[null,41817.7,1477.5,1477.5,null,3753.5,1477.5,null,37729.8,null,null,37729.8,36873.9,1477.5,null,37729.8,0,null,1477.5,1477.5,1477.5,1477.5,37729.8,1477.5,null
[17497.9,null,null,null,6754.1,null,null,2349.3,null,6754.1,6754.1,null,null,null,6754.1,null,null,0,null,null,null,null,null,null,6754.1
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[null,7544.9,37597.4,37597.4,null,39256.1,37597.4,null,0,null,null,0,1831.7,37597.4,null,0,37691.8,null,37597.4,37597.4,37597.4,37597.4,0,37597.4,null
[null,41668.4,0,0,null,4013.8,0,null,37580.5,null,null,37580.5,36724.6,0,null,37580.5,1555.8,null,0,0,0,0,37580.5,0,null
[24252,null,null,null,0,null,null,4404.8,null,0,0,null,null,null,0,null,null,6754.1,null,null,null,null,null,null,0]
```

Start at the getMatrix entry point in mapbox-sdk-js and reproduce the request with the supplied locations and profile. Compare the master response with the npm version and inspect how the matrix response is handled. Done means the same request no longer produces unexpected null values, with the expected behavior verified against the reproduced output.

Written by the indexing model from the issue text.