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wrangler
patch

fix: prevent infinite loop when fetching a list of results

When fetching a list of results from cloudflare APIs (e.g. when fetching a list of keys in a kv namespace), the api returns a cursor that a consumer should use to get the next 'page' of results. It appears this cursor can also be a blank string (while we'd only account for it to be undefined). By only accounting for it to be undefined, we were infinitely looping through the same page of results and never terminating. This PR fixes it by letting it be a blank string (and null, for good measure)