Use correct manifest file name in the Manifest verifier checks. Also - extra null check
The test doesn't reproduce the exact issue reported but should prevent future regressions in this area. ------------- Commit messages: - 8273826: Correct Manifest file name and NPE checks Changes: https://git.openjdk.java.net/jdk/pull/5841/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5841&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8273826 Stats: 137 lines in 5 files changed: 127 ins; 2 del; 8 mod Patch: https://git.openjdk.java.net/jdk/pull/5841.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/5841/head:pull/5841 PR: https://git.openjdk.java.net/jdk/pull/5841
