RFR: 8293862: javax/swing/JFileChooser/8046391/bug8046391.java failed with 'Cannot invoke "java.awt.Image.getWidth(java.awt.image.ImageObserver)" because "retVal" is null'

[Tejesh R]

Observation found when JFileChooser is instantiated in WindowsLookAndFeel which invokes getSystemIcon() from WindowsFileChooserUI class. Could not find the exact root cause so predicting it to be an issue with icons not loaded where resolutionVariants map is empty in _public Image getResolutionVariant(double width, double height) _. Hence proposing a null check before accessing getWidth(). Fix is tested in CI system.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jdk/pull/11104/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11104&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293862
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11104.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11104/head:pull/11104

PR: https://git.openjdk.org/jdk/pull/11104