File Backed HTTP Metadata Provider: Refresh Delay Factor lacks visible validation message

Scenario: Entering an invalid value in the Refresh Delay Factor field...

Browser(s): Edge 44.17763

1. Create a File Backed HTTP Metadata Provider
2. Advance to the Reloading Attributes
3. enter a value outside the 0.0 to 1.0 range

Expected result: A validation message should be displayed
Actual result: The Next button becomes inactive, but no validation message is displayed.