fix some viewer bugs #1409

Job	Run time
initialize	7s
initialize	7s
lint_python (ubuntu-20.04, 3.9)	4m 29s
lint_python (ubuntu-20.04, 3.9)	4m 29s
build_js (ubuntu-20.04, 3.9, 18.x)	15m 39s
build_js (ubuntu-20.04, 3.9, 18.x)	15m 39s
build_pyodide (ubuntu-20.04)	21m 26s
build_pyodide (ubuntu-20.04)	21m 26s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	25m 10s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	25m 10s
test_js (ubuntu-20.04, 3.9, 18.x)	14m 33s
test_js (ubuntu-20.04, 3.9, 18.x)	11m 42s
benchmark_js	0s
benchmark_js	0s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	7m 28s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	7m 28s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	6m 9s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	6m 9s
test_python_sdist	0s
test_python_sdist	0s
benchmark_python	0s
benchmark_python	0s
publish	0s
publish	0s
	3h 7m 11s

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