Python: False positive in py/non-iterable-in-for-loop

[s0]

Description of the false positive

Seems to not be working properly with asynchronous generators.

URL to the alert on the project page on LGTM.com

https://lgtm.com/projects/g/aio-libs/aiodocker/snapshot/81e8d5b486a5ced77c203dcc0d3de797dbbf7982/files/aiodocker/multiplexed.py?sort=name&dir=ASC&mode=heatmap#x432dcd76eee0e11b:1

[webknjaz]

FTR I've posted a clarification comment on the PR: #1998 (comment)