Unload: fixed bug in unloading a database class without properties. Added test. Fixes #2174.
Unload: fixed missed bug of the bug. Fixes #2174.
Merge branch 'VersionToUnloadBranch' of github.com:Starcounter/Starcounter into MergeUnload

Conflicts:
	src/Starcounter/Mock/Reload.cs
Merge branch 'VersionToUnloadBranch' of github.com:Starcounter/Starcounter into MergeUnload

Conflicts:
	src/Starcounter/Mock/Reload.cs
Fixed regression test according to the added test.