Fix notices in upgrade functions, chines tokenizer, and summarizer, a=chris

Author Chris Pollett <chris@pollett.org>
Author date 2020-08-12 20:Aug:th
Author local date 2020-08-12 13:Aug:th -0700
Committer Chris Pollett <chris@pollett.org>
Committer date 2020-08-12 20:Aug:th
Committer local date 2020-08-12 13:Aug:th -0700
Commit 320711483ed5d74e6a1edd29e8909a2d9203ef8c
Tree c5065bbb415c9fb6c16e519bcd32c0cb21fcb356
Parent a0e9409a98e2843cefb8de4b74ef4e84097d96ac
Fix notices in upgrade functions, chines tokenizer, and summarizer, a=chris
Affected files:
src/library/UpgradeFunctions.php
src/library/summarizers/Summarizer.php
src/locale/zh_CN/resources/Tokenizer.php
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