`Parse.Query.explain` breaks `Parse.Cloud.afterFind`

[dplewis]

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Issue Description

Since query.explain doesn't return a Parse object it causes weird behavior in afterFind.

Steps to reproduce

Create an afterFind trigger, in the afterFind perform some array operation on req.objects. Call query with explain enabled.

Actual Outcome

If the afterFind is empty the explain results are never returned. If afterFind performs some operation they can have unexpected behavior

Expected Outcome

Should skip afterFind or allow explain results to pass through or explain should return array.

[parse-github-assistant]

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