> This PR fixes 2 NPEs in Choice-and ComboBox, when the selection model is null.
> 
> ChoiceBox: 
> - Null check in **valueProperty()** listener
> 
> ComboBox:
> - Null check in **valueProperty()** listener
> - Null check in **ComboBoxListViewSkin#updateValue()**
> 
> The tests checks, that no NPE is printed to the console. They also checks, 
> that the set value is still displayed (either in the ComboBox button cell or 
> the ChoiceBox display label)

Marius Hanl has updated the pull request incrementally with one additional 
commit since the last revision:

  Added another cbx test + cleaned up exception handler + let the exception 
bubble up instead of try-catch

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

Changes:
  - all: https://git.openjdk.java.net/jfx/pull/557/files
  - new: https://git.openjdk.java.net/jfx/pull/557/files/a47c0652..0b631ed4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jfx&pr=557&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jfx&pr=557&range=01-02

  Stats: 44 lines in 2 files changed: 29 ins; 12 del; 3 mod
  Patch: https://git.openjdk.java.net/jfx/pull/557.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/557/head:pull/557

PR: https://git.openjdk.java.net/jfx/pull/557

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