Augmentation Pagination and General Error handling

[JakeWags]

Adds augmentation pagination for the samples. Default to 12 per page.

Adds error handling to training tab to avoid any issues with no deepssm_error data array. If there is no deepssm_error data array, ignore any heatmap and just render the shape in white. (I can't really test this locally as I can't reproduce the error, but I set data = undefined as a test and that rendered just the white shape)

This example has 30 augmentation samples generated:

[JakeWags]

@annehaley You're good to merge whenever