RFR: JDK-8277522: Make formatting of null consistent in Elements

[Joe Darcy]

Simple formatting cleanup.

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Commit messages:
 - JDK-8277522: Make formatting of null consistent in Elements

Changes: https://git.openjdk.java.net/jdk/pull/6494/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6494&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8277522
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6494.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6494/head:pull/6494

PR: https://git.openjdk.java.net/jdk/pull/6494