executeFetch: fix entities loop condition

[erankor]

Something small that I noticed while looking at the code: the loop iterates on receivedEntities, not entities. normally the two arrays will have the same length, however if the condition if (representation && representation[TypeNameMetaFieldDef.name]) is skipped, receivedEntities will contain fewer elements than entities.

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[jeffjakub]

Thanks for raising this issue! Could you provide a test so we can reproduce this problem?