Code clean up. Remove obsolete comments, unused imports, and unneeded jtreg test parameter. Fix the code to handle the case when installers are not created and there is nothing to verify in the test.
------------- Commit messages: - 8281170: Test jdk/tools/jpackage/windows/WinInstallerIconTest always fails on Windows 11 Changes: https://git.openjdk.java.net/jdk/pull/7481/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7481&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8281170 Stats: 46 lines in 1 file changed: 12 ins; 19 del; 15 mod Patch: https://git.openjdk.java.net/jdk/pull/7481.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/7481/head:pull/7481 PR: https://git.openjdk.java.net/jdk/pull/7481
