Indexing with 0-dimensional arrays

[neosunhan]

Description

• Fixes a bug where adding a dimension (via slicing with None) on an array with an axis of length 0 results in an error.
• Fixes a bug where using a 0-dimensional array to index results in an error.

Issue/s resolved: #1012, #1019

Changes proposed:

Type of change

• Bug fix (non-breaking change which fixes an issue)

Due Diligence

• [ ] All split configurations tested
• [ ] Multiple dtypes tested in relevant functions
• [ ] Documentation updated (if needed)
• [ ] Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

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Legend

[ClaudiaComito]

Thanks for this @neosunhan . These problems are being addressed in the general indexing overhaul #938 . I'm going to close this PR for now.