Fix mergeProxiedResults errors aggregation #1621
Merged
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if sources.length > 0, errors will be in the form [[]], making it non empty, while the source result set is empty. Any code path that checks errors length for result errors will erroneously detect errors.
eg: in handleNull: https://github.com/ardatan/graphql-tools/blob/master/packages/delegate/src/results/handleNull.ts#L6