fix: TypeError: Cannot read properties of undefined (reading 'filter') - when trying to delete a org/team with runners

close #210

src/models/entities/Runner.ts

@@ -57,7 +57,10 @@ export class Runner extends Participant {
    * This is implemented here to avoid duplicate code in other files.
    */
   public get validScans(): Scan[] {
-    return this.scans.filter(scan => scan.valid == true);
+    if (this.scans) {
+      return this.scans.filter(scan => scan.valid == true);
+    }
+    return []
   }
 
   /**