strongloop / loopback / 6258

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fix: resolve customAccessToken warning error that causes app to crash

In the present implementation `verifyUserRelations(Model)` assumes that
`Model.relations.accessTokens` is always set, and as a result may
crash when trying to access `polymorphic` property of that relation.

It seems the intention is to check whether the the following conditions are met:
 1. a model has a hasMany accessTokens relation
 2. that relation is polymorphic

This commit fixes the problem by accounting for the case where the
accessTokens relation was not correctly set up.

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