feat(api): add ability for whitelist to filter by undefined attribute

The entities whitelist can now specify an attribute undefined on the target data. If the attribute is undefined, the entity will be filtered out.

src/lib/filters/entities.js

@@ -92,7 +92,9 @@ export const shouldKeepEntityByAttribute = (
 
   const isValid = Object.keys(whitelist).every((attr) => {
     const regex = new RegExp(whitelist[attr])
-    return regex.test(data[attr])
+    const hasData = data.hasOwnProperty(attr)
+
+    return hasData && regex.test(data[attr])
   })
 
   return isValid

src/lib/filters/entities.test.js

@@ -224,6 +224,26 @@ describe("entities", () => {
       })
     })
 
+    it("attribute not defined on entities", () => {
+      expect(
+        shouldKeepEntityByAttribute(
+          [
+            {
+              type: "LINK",
+              whitelist: {
+                id: ".*",
+              },
+            },
+          ],
+          "LINK",
+          {
+            href: "#_msocom_1",
+            target: "_blank",
+          },
+        ),
+      ).toBe(false)
+    })
+
     describe("defaults", () => {
       it("missing config", () => {
         expect(