Fix 1913 empty boolean mask

[oleksandr-pavlyk]

Closes gh-1913

Add special-casing for empty mask in the implementation of tensor.place, which is used by usm_ndarray.__setitem__ as well.

Added tests.

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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.19.0dev0=py310hdf72452_283 ran successfully.
Passed: 894
Failed: 2
Skipped: 118

[coveralls]

coverage: 87.671% (+0.003%) from 87.668%
when pulling 2a643dd on fix-1913-empty-boolean-mask
into 4a94ef9 on master.

[ndgrigorian]

LGTM!