Fix jpackage error output when "--type" CLI option is missing and jpackage detects that it can't build native packages in the environment.
------------- Commit messages: - 8272815: jpackage --type rpm produces an error: Invalid or unsupported type: [null] Changes: https://git.openjdk.java.net/jdk/pull/5512/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5512&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8272815 Stats: 18 lines in 2 files changed: 2 ins; 4 del; 12 mod Patch: https://git.openjdk.java.net/jdk/pull/5512.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/5512/head:pull/5512 PR: https://git.openjdk.java.net/jdk/pull/5512
