fix: events optional parameters

src/views/page-events.pug

 div.whitespace-normal
   solid-event(
     data-src=`${component.endpoints.events}`
-    past-events=`${component.parameters.pastevents}`
-    visiblecheckbox=`${component.parameters.visiblecheckbox}`
-    visibilityregions=`${component.parameters.visibilityregions}`
+    past-events=`${component.parameters ? component.parameters.pastevents : "hidden"}`
+    visiblecheckbox=`${component.parameters ? component.parameters.visiblecheckbox : "hidden"}`
+    visibilityregions=`${component.parameters ? component.parameters.visibilityregions : "hidden"}`
     range-event-region=`${component.endpoints.regionevents}`
     range-event-type=`${component.endpoints.typeevents}`
     range-event-circle=`${getComponent('circles').endpoints.get}/`