PyOpenCL array context: don't fail if no transform #1638

Job	Run time
Pylint	1m 36s
Pytest Conda Py3 POCL	2m 24s
Ruff	7s
Mypy	1m 39s
Typos	4s
Documentation	1m 38s
Tests for downstream project meshmode	12m 27s
Examples Conda Py3	1m 27s
Tests for downstream project grudge	10m 21s
Pytest Conda Py3 Intel	2m 23s
Tests for downstream project mirgecom	2s
Tests for downstream project mirgecom_examples	3s
	34m 11s

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