No `default_complex` when `xp.asarray` is not present

[mtsokol]

Hi!
I noticed that there isn't a default complex dtype when xp.asarray is not present if branch. Is it on purpose, or could default_complex be added there? (it causes a setup failure when running tests for a lib without xp.asarray)

array-api-tests/array_api_tests/dtype_helpers.py

Line 237 in b5ed713

default_float = xp.float32

[honno]

Nice catch, yeah this would be a problem. Although generally if a library doesn't have xp.asarray not much is going to get tested anyway 😅