Fix datetime index on resample #333
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The _resample method in
AlpacaStore.get_aggs_from_alpacawas crashing on an empty DataFrame and also was using._rawon theEntityListresponse which looks like it doesn't guarantee setting of thetimestampcolumn as a DateTimeIndex. Both of these conditions would causeTypeError: Index must be DatetimeIndexto be raised on backfill.I also added some debug logging that is helpful in diagnosing these issues. The project has no real tests so logging is at least useful to do some basic debugging.