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Avoid creating new time on invalid time token #181

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The parser attempts to parse each string token as time. In case of a non-time token, a time.Now() instance is created, which is immediately discarded. In a tight loop this unnecessary allocation can drastically slow down template parsing.

This PR simply returns time's empty value, which does not cause an allocation.

The parser attempts to parse each string token as time. In case of a non-time token, a time.Now() instance is created, which is immediately discarded. In a tight loop this unnecessary allocation can drastically slow down template parsing.

This PR simply returns time's empty value, which does not cause an allocation.
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