[Rev 01] RFR: 8237372: NullPointerException in TabPaneSkin.stopDrag

[Robert Lichtenberger]

> Test simulates a single mouse-released event.
> Fix simply guards against the null case.

The pull request has been updated with 1 additional commit.

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Added commits:
 - 30290116: 8237372: NullPointerException in TabPaneSkin.stopDrag

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/89/files
  - new: https://git.openjdk.java.net/jfx/pull/89/files/923a63b2..30290116

Webrevs:
 - full: https://webrevs.openjdk.java.net/jfx/89/webrev.01
 - incr: https://webrevs.openjdk.java.net/jfx/89/webrev.00-01

  Stats: 7 lines in 1 file changed: 3 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jfx/pull/89.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/89/head:pull/89

PR: https://git.openjdk.java.net/jfx/pull/89