Make CustomFormatToISO return null on Exception in parsing dates
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Key: PIG-2515
URL: https://issues.apache.org/jira/browse/PIG-2515
Project: Pig
Issue Type: Improvement
Components: piggybank
Affects Versions: 0.9.1, 0.9.2, 0.10, 0.11
Reporter: Russell Jurney
Dates are often ugly and malformed, and it is highly inconvenient for
CustomFormatToISO to kill an entire run because a single date does not format.
As other string utilities in piggybank return null on error, so should
CustomFormatToISO.
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