RFR: 8305505: NPE in javazic compiler

[Naoto Sato]

On Tue, 18 Apr 2023 05:08:35 GMT, Yoshiki Sato <ysatowse at openjdk.org> wrote:

> Please review this PR.  
> With this minor change, the javazic compiler (Main.java) can produce the HTML files that display given time zone data correctly.

I revisited the code, and now think that `mapList` better be `null`, as it indicates the map option was not provided, so I think modifying the offending line as

            LatitudeAndLongitude location = (mapList != null ? mapList.get(zonename) : null);

may be cleaner.

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PR Review: https://git.openjdk.org/jdk/pull/13504#pullrequestreview-1400371061