databaseId=WOK and modifiedTimeSpan parameters are incompatible.

[gneissone]

Describe the bug
WOK search no longer works because API does not accept modifiedTimeSpan parameters. The exporter returns this error even if no modifiedTimeSpan is provided by the user.

To Reproduce

Expected behavior
Query works with WOK when modifiedTimeSpan is not provided

Desktop (please complete the following information):
macOS

Additional context
The modifiedTimeSpan parameter has never worked with WOK, but a recent change to the API returns an error if it's provided rather than returning an incorrect result set.