[bug] fix to_table for a non-array input when a low-precision queue is used

[icfaust]

Description

This fixes an issue discovered in #2253 where it would try to query the dtype of a None object. First must be checked if it is an array, then the necessary dtype verification should occur. This error only arises for SYCL GPUs which do not have the fp64_aspect.

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[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
onedal/datatypes/data_conversion.cpp	20.00%	0 Missing and 4 partials ⚠️

Flag	Coverage Δ
azure	77.96% <100.00%> (-0.01%)	⬇️
github	71.03% <33.33%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
onedal/basic_statistics/basic_statistics.py	100.00% <100.00%> (ø)
onedal/datatypes/data_conversion.cpp	50.24% <20.00%> (+0.24%)	⬆️

... and 2 files with indirect coverage changes

[icfaust]

/intelci: run

[icfaust]

/intelci: run