<Swing Dev> RFR: 8028281: [TEST_BUG] [macosx] javax/swing/JTabbedPane/7024235/Test7024235.java fails

[Sergey Bylokhov]

The test fails because of a missed null check for the next method:
https://docs.oracle.com/en/java/javase/15/docs/api/java.desktop/javax/swing/JTabbedPane.html#getBoundsAt(int)

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Commit messages:
 - Update Test7024235.java
 - Initial fix

Changes: https://git.openjdk.java.net/jdk/pull/852/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=852&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8028281
  Stats: 20 lines in 2 files changed: 8 ins; 7 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/852.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/852/head:pull/852

PR: https://git.openjdk.java.net/jdk/pull/852