Fix issue with legacy mouseover tooltips

Author: cmdcolin

packages/core/src/util/jexl.ts

@@ -8,7 +8,7 @@ export default function JexlF(/* config?: any*/) {
   // ones passed in
 
   // below are core functions
-  j.addFunction('get', (feature: Feature, data: string) => feature.get(data))
+  j.addFunction('get', (feature: Feature, data: string) => feature?.get(data))
   j.addFunction('parent', (feature: Feature) => feature.parent?.())
 
   j.addFunction('id', (feature: Feature) => feature.id())