Fixed scan runner in response

ref #67

src/models/responses/ResponseRunner.ts

@@ -29,7 +29,8 @@ export class ResponseRunner extends ResponseParticipant {
      */
     public constructor(runner: Runner) {
         super(runner);
-        this.distance = runner.scans.filter(scan => { scan.valid === true }).reduce((sum, current) => sum + current.distance, 0);
+        if (!runner.scans) { this.distance = 0 }
+        else { this.distance = runner.scans.filter(scan => { scan.valid === true }).reduce((sum, current) => sum + current.distance, 0); }
         this.group = runner.group;
     }
 }