RFR: 8353845: com.sun.javafx.css.BitSet.equals(null) throws NPE [v2]

[Michael Strauß]

> Fixes the bug that `BitSet.equals(null)` throws NPE.
> 
> A single reviewer should be sufficient.

Michael Strauß has updated the pull request incrementally with one additional commit since the last revision:

  obj == null

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1766/files
  - new: https://git.openjdk.org/jfx/pull/1766/files/c051eea3..fda65a71

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1766&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1766&range=00-01

  Stats: 6 lines in 1 file changed: 5 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1766.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1766/head:pull/1766

PR: https://git.openjdk.org/jfx/pull/1766