Error with Base Layer Group setup

[minhnguyenlinknode]

Viewer does not work when Map having Base Layer Group setup with scale. In my example I have added a raster layer to Base Layer Group then I got this error message:

An error occurred during startup
scales is null
Stack Trace
deArrayifyScaleRanges@http://localhost/mapguide31/viewer2/dist/viewer.js:8840:6
deArrayifyLayers/<@http://localhost/mapguide31/viewer2/dist/viewer.js:8876:26
deArrayifyLayers@http://localhost/mapguide31/viewer2/dist/viewer.js:8862:13
deArrayifyRuntimeMap@http://localhost/mapguide31/viewer2/dist/viewer.js:8951:17
deArrayify@http://localhost/mapguide31/viewer2/dist/viewer.js:9530:17
MapGuide</MapAgentRequestBuilder</MapAgentRequestBuilder.prototype.get/</<@http://localhost/mapguide31/viewer2/dist/viewer.js:37861:26

[minhnguyenlinknode]

It seems to be fixed in #76