Fix broken error reporting for Chapel 2.0 in `register-commands.py` #7930

Job	Run time
flake8	1m 27s
lint	2s
arkouda_chpl_portability (2.0.0)	13m 18s
arkouda_benchmark_linux (chapel, 2)	8m 45s
arkouda_multi-dim (2.0.0)	19m 5s
arkouda_python_portability (3.9)	14m 7s
arkouda_python_portability (3.10)	13m 52s
arkouda_tests_linux (chapel, 2)	15m 33s
docs	3m 45s
mypy	1m 46s
arkouda_python_portability (3.11)	13m 3s
	1h 44m 43s

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