Filter values not applied to results when using a default value of "is any value"

[parose]

Ran into an issue where a Lookerbot command was set up with a Dashboard filter that had a default filter value of "is any value". Even when entering a filter value along with the Lookerbot command, the Lookerbot would return results that were not being filtered. For example, these two commands were returning the same results:
@lookerbot dashboard_name filter_value
@lookerbot dashboard_name

Changing the default filter value to "is not null" made it so that filters were applied correctly when calling the command