RFR: 8287609: Add null-check for tagsArray returned from CTFontCopyAvailableTables

[Phil Race]

On Tue, 31 May 2022 23:39:09 GMT, Nikita Gubarkov <duke at openjdk.java.net> wrote:

> `CTFontCopyAvailableTables` can return null, which causes subsequent call to `CFArrayGetCount` to crash with SEGFAULT, just added a null-check.

Where do you read it can return null ?

https://developer.apple.com/documentation/coretext/1510774-ctfontcopyavailabletables?language=objc

says nothing ..

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PR: https://git.openjdk.java.net/jdk/pull/8962