fixed up the partition shrink code
fixed up the partition shrink code

fixed a bad return type, added message
to assure users that empty parts are ok
in this case.

YetAnotherMinion/core,yangf4/core,yangf4/core,yangf4/core,YetAnotherMinion/core,YetAnotherMinion/core,YetAnotherMinion/core,yangf4/core,yangf4/core,YetAnotherMinion/core