`CTFontCopyAvailableTables` can return null, which causes subsequent call to `CFArrayGetCount` to crash with SEGFAULT, just added a null-check.
------------- Commit messages: - 8287609: Add null-check for tagsArray returned from CTFontCopyAvailableTables Changes: https://git.openjdk.java.net/jdk/pull/8962/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8962&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8287609 Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod Patch: https://git.openjdk.java.net/jdk/pull/8962.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/8962/head:pull/8962 PR: https://git.openjdk.java.net/jdk/pull/8962
