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Make hookErrorHandler() only care about serious signature errors

Authored by aaron.

Description

Make hookErrorHandler() only care about serious signature errors

Previously, it would send all manor of warnings to the error
and error-json channels. This adds a lot of overhead due to
AbuseFilter parse/eval errors. By passing immediately instead
of after calling handleError(), that overhead is avoided. Since
it still passes (e.g. returns false), any default PHP warning
logging still applies.

Change-Id: I18e60c09c2a48f2e26abab5d451bb52ea4ba7961