git: openjdk/jdk: 8272815: jpackage --type rpm produces an error: Invalid or unsupported type: [null]

[Alexey Semenyuk]

Changeset: a3ca7702
Author:    Alexey Semenyuk <asemenyuk at openjdk.org>
Date:      2021-09-15 13:22:26 +0000
URL:       https://git.openjdk.java.net/jdk/commit/a3ca770227065aecc2df9f9c711687fd8ec5d34e

8272815: jpackage --type rpm produces an error: Invalid or unsupported type: [null]

Reviewed-by: herrick, almatvee

! src/jdk.jpackage/share/classes/jdk/jpackage/internal/Arguments.java
! test/jdk/tools/jpackage/share/jdk/jpackage/tests/ErrorTest.java