[2.4.0] Checkmk Werk 17165 created: Fix warning on rule creation of "Icon image for..."

[//]: # (werk v2) # Fix warning on rule creation of "Icon image for..." key | value ---------- | --- compatible | yes version | 2.4.0b1 date | 2024-08-15T12:53:28+00:00 level | 1 class | fix component | wato edition | cre If you created a new rule "Icon image for hosts in status GUI" or "Icon image for services in status GUI", a warning like "Unable to read current options of this rule" was shown. The rule could still be created.