<i18n dev> RFR: 8305505: NPE in javazic compiler [v2]

[Yoshiki Sato]

> 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.

Yoshiki Sato has updated the pull request incrementally with one additional commit since the last revision:

  Insert null check for mapList at its usage instead of initializing mapList

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13504/files
  - new: https://git.openjdk.org/jdk/pull/13504/files/2864658d..3d726b3c

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13504&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13504&range=00-01

  Stats: 23 lines in 1 file changed: 6 ins; 9 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/13504.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13504/head:pull/13504

PR: https://git.openjdk.org/jdk/pull/13504