RFR: 8272815: jpackage --type rpm produces an error: Invalid or unsupported type: [null] [v2]

[Alexey Semenyuk]

> Fix jpackage error output when "--type" CLI option is missing and jpackage detects that it can't build native packages in the environment.

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  dummy commit

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5512/files
  - new: https://git.openjdk.java.net/jdk/pull/5512/files/caac338f..44cf9fde

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5512&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5512&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 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