RFR: 8263899: HttpClient throws NPE in AuthenticationFilter when parsing www-authenticate head

[Michael McMahon]

Could I get the following simple fix reviewed please?

Thanks,
Michael.

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Commit messages:
 - Initial fix

Changes: https://git.openjdk.java.net/jdk/pull/3113/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3113&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263899
  Stats: 77 lines in 2 files changed: 76 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3113.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3113/head:pull/3113

PR: https://git.openjdk.java.net/jdk/pull/3113