Fix NPE when `path.getParent()` in `LinuxHelper.getDesktopFiles()` returns null. The issue is deb-specific, there is no such problem with rpm packages.
------------- Commit messages: - 8364984: Many jpackage tests are failing on Linux after JDK-8334238 Changes: https://git.openjdk.org/jdk/pull/26677/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=26677&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8364984 Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/26677.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/26677/head:pull/26677 PR: https://git.openjdk.org/jdk/pull/26677
