RFR: JDK-8281944: JavaDoc throws java.lang.IllegalStateException: ERRONEOUS

[Jonathan Gibbons]

Please review a simple change to handle erroneous content in an `@see` tag.

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Commit messages:
 - JDK-8281944: JavaDoc throws java.lang.IllegalStateException: ERRONEOUS

Changes: https://git.openjdk.java.net/jdk/pull/7603/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7603&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281944
  Stats: 47 lines in 2 files changed: 44 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7603.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7603/head:pull/7603

PR: https://git.openjdk.java.net/jdk/pull/7603