Fixes: U4-4466 6.2-beta - Creating Member Type without Alias results in no viewable Member Types in back office
Merge remote-tracking branch 'origin/6.2.0' into 7.1.0

Conflicts:
	src/Umbraco.Core/Models/MemberType.cs
	src/Umbraco.Core/Persistence/Repositories/MemberTypeRepository.cs
	src/Umbraco.Tests/Persistence/Repositories/MemberTypeRepositoryTest.cs