[SDK] Fix dotest

[aaronreed708]

Problem/Concern

As we will start running the SDK tests more often as we add changes to the SDK, we need to make sure that they are working correctly.

Currently test/dotest.ts is failing in two places:

1. assert failing on line 159 because CSSVarGroup listener for ds.organisms.hero is being called 8 times instead of the expected 4 times.
2. Running the "TEST: BUTTON SELECTION 0" fails during listener notification because the theme's gradient1 and gradient2 don't have "from" values.
   • failing listener is: _tb.cssGenerator.CSSTheme.button

Proposed Solution

Fix the testcase so that it runs to successful completion.

[aaronreed708]

Debugging exception in notification listener:

Call Stack:
colorTheme.getModeShadeGroups <-- throwing error line 461
colorTheme.getShadeGroups
cssGenerator.shadeGroupListener