[OpenJDK 2D-Dev] RFR: 8263984: Invalidate printServices when there are no printers [v3]

[Sergey Bylokhov]

On Tue, 6 Apr 2021 20:38:57 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> When `getAllPrinterNames()` returns null, the list of `printServices` is assigned a new empty array without invalidating old services which were in the array before.
>> 
>> The old print services should be invalidated.
>
> Alexey Ivanov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add a blank line to separate condition from body

Marked as reviewed by serb (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/3151