Implemented adress deletion (through reset)

ref #105

src/models/actions/update/UpdateRunner.ts

@@ -36,7 +36,8 @@ export class UpdateRunner extends CreateParticipant {
         runner.phone = this.phone;
         runner.email = this.email;
         runner.group = await this.getGroup();
-        runner.address = this.address;
+        if (!this.address) { runner.address.reset(); }
+        else { runner.address = this.address; }
         Address.validate(runner.address);
 
         return runner;