RFR: 8376169: JPopupMenu.setInvoker(null) causes NPE [v5]

[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:

  Test update

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/29377/files
  - new: https://git.openjdk.org/jdk/pull/29377/files/b588d51d..908bf782

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29377&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29377&range=03-04

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 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