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Fixes #8835
In cases where the registry failed to load, and the sig is set to `{}` on this line: e85b162651/ui/app/helpers/utils/transactions.util.js (L78)
this proceeds to set the method prefix to `{}` in knownMethodData.
Additionally check if the method prefix object is empty to proceed call getMethodDataAsync again.
I could only reproduce by intentionally failing the method registry lookup and found this solution. I could not find an instance where the registry consistently failed to lookup even on slow/throttled/high latency networks.