bug: Ml nodata

[mmann1123]

What is this PR changing?

• fixes install issue with pip [ml]
• avoids predicting empty rasters Resolves #270
• throws error if stack_dim is time. Resolves #311

Checklist

• [ x] Remember to add a semantic tag to the commit name

[mmann1123]

I don't have the ability to merge here, assuming you will bundle it with the others