fix: Avoid panic if target is blank/dir and no packager is specified. #179
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In #157 I accidentally introduced a bug that results in a panic if
--target
is a directory or blank. This pull request fixes this by printing a useful error message instead.A minor issue: The
doPackage()
line limit enforced bygolangci-lint:funlen
is exceeded by 4 lines which in my opinion is acceptable, so i added// nolint:funlen
.