nattka should not crash, if package format is wrong

[jonasstein]

Nattka should not crash, if package format is wrong.
It should be able to catch the error and report it to the user with an useful error message

nattka make-package-list -s 'app-crypt/dieharder'
ERROR: Version number missing. Expected =cat/pkg-ver

nattka make-package-list -s 'app-crypt/dieharder-3.31.1-r4'
// unsure, if nattka should be able to work without `=`? or if it should tell the user what is wrong here.

nattka make-package-list -s '=app-crypt/dieharder-3.31.1-r4 amd64'
ERROR: Architecture is required in case of first time stabilization. Expected =cat/pkg-ver ARCH1 ARCH2 ...