MAINT: Allocate fewer bytes for empty arrays.

Currently the number of bytes allocated is the product of the non-zero
dimensions x element_size, which can create huge memory allocations for
empty arrays. Change that to just allocate enough for one element. Some
allocation is needed for the array.data attribute to work correctly.

Note: Could probably allocate a minimal number of bytes, say 16 as
dictated by alignment, but the old intended number is used here as a
more conservative fix.

Closes #7813.

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