Color scale bar error handling for missing deepssm_error

[JakeWags]

Adds a check to see if the shapedata (.vtk files) have deepssm_error and do not render the color bar (non-uniform scale only)

Currently there is an error thrown if the user selects non-uniform scale on the training tab only.

Tested locally by choosing an index to pretend it doesn't have deepssm_error. Should simply not render the heatmap or color scale.