Avoid displaying CoachClassListPage until after data is finished loading #5917

Job	Run time
prnumber	2s
Build WHL file / Build WHL	9m 15s
Build EXE file / Build EXE file	1m 27s
Build DMG file / build_dmg	5m 43s
Build DEB file / Build DEB file	6m 17s
Build APK file / build_apk	21m 51s
Build PEX file / Build PEX	41s
Build Raspberry Pi Image / Build Pi image	5m 57s
	51m 13s

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