We can use Hashtable.putIfAbsent instead of pair `get`/`put` methods. It's faster and cleaner.
------------- Commit messages: - [PATCH] CSS. Use Hashtable.putIfAbsent instead of pair get/put Changes: https://git.openjdk.org/jdk/pull/22032/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22032&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8354791 Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/22032.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22032/head:pull/22032 PR: https://git.openjdk.org/jdk/pull/22032
