`expedia_hotel_log` doesn't work about sdgym

[npatki]

Ultimately, we should make sure that the benchmarking script is fault-tolerant. If an individual piece of code doesn't run, it should catch the error and report a NaN in the final results. See docs for desired behavior.

Note that there are several related issues to this dataset & metric combo (not direct causes):

• SDV 1375: The metadata for expedia_hotel_logs doesn't accurately reflect the data
• SDMetrics 337: The metric is trying to convert this into a number instead of a datetime

[fealho]

As mentioned in #219, the SDGym benchmarking script is already fault-tolerant, so no changes need to be made in SDGym.