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Handle missing parser in onParserAfterParse

Authored by Yurik.

Description

Handle missing parser in onParserAfterParse

Sometimes onParserAfterParse() is given a null value
instead of a valid parser object. Gracefully handle it.

Bug: T108819
Change-Id: Ic305a1ecd9667b93a3b136dd3c1bc198ae5a7504