oops - clear blankPage when we're done #488

Job	Run time
build (windows-2019, 3.8, x86)	6m 54s
build (windows-2019, 3.8, x64)	6m 2s
build (windows-2019, 3.9, x86)	7m 24s
build (windows-2019, 3.9, x64)	6m 1s
build (windows-2019, 3.10, x86)	7m 31s
build (windows-2019, 3.10, x64)	5m 53s
build (windows-2019, 3.11, x86)	7m 55s
build (windows-2019, 3.11, x64)	6m 40s
build (windows-2019, 3.12, x86)	9m 6s
build (windows-2019, 3.12, x64)	7m 39s
build (ubuntu-20.04, 3.8, x64)	10m 21s
build (ubuntu-20.04, 3.9, x64)	12m 7s
build (ubuntu-20.04, 3.10, x64)	11m 48s
build (ubuntu-20.04, 3.11, x64)	11m 7s
build (ubuntu-20.04, 3.12, x64)	11m 18s
build (macos-12, 3.8, x64)	15m 47s
build (macos-12, 3.9, x64)	15m 49s
build (macos-12, 3.10, x64)	15m 49s
build (macos-12, 3.11, x64)	11m 40s
build (macos-12, 3.12, x64)	13m 57s
add-test-result-status-badges	1s
package	1s
upload	1s
	3h 20m 51s

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