RFR: 8376169: JPopupMenu.setInvoker(null) causes NPE [v2]

[Prasanta Sadhukhan]

> Invoking `JPopupMenu.setInvoker(null)` causes NPE which is fixed in this PR

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  8376169

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29377/files
  - new: https://git.openjdk.org/jdk/pull/29377/files/c47c5cb0..c78ede27

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29377&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29377&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29377.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29377/head:pull/29377

PR: https://git.openjdk.org/jdk/pull/29377