Fix handleCharacters by adding a guard to zero length and letting the rest of the process continue (e.g. closing tags and etc).
------------- Commit messages: - 8349516: StAXStream2SAX.handleCharacters() fails on empty CDATA Changes: https://git.openjdk.org/jdk/pull/23847/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23847&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8349516 Stats: 54 lines in 2 files changed: 51 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/23847.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/23847/head:pull/23847 PR: https://git.openjdk.org/jdk/pull/23847
