install-package: don't set lazy-install pkg is nil
install-package: don't set lazy-install pkg is nil

Fix bug: When the list of package names returned by
configuration-layer//get-uninstalled-packages contains a package that
isn't contained in configuration-layer--packages, then
configuration-layer//install-package throws "wrong-argument-type:
eieio-object-p nil" error at startup.
configuration-layer//install-packages catches it and prints it in the
home buffer.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs