title: error on form ANGULAR 2 - Cannot read property of undefined
body: <p>I have this error when I start the component:</p>
  
  <pre><code>ORIGINAL EXCEPTION: Cannot read property 'cliente' of undefined
  </code></pre>
  
  <p>HTML:</p>
  
  <pre><code>&lt;select class="form-control input-lg" formControlName="cliente" name="cliente" [(ngModel)]="usuario.cliente"&gt;
    &lt;option [ngValue]=""&gt;Selecione&lt;/option&gt;
    &lt;option *ngFor="let cliente of clientes" [ngValue]="cliente" [selected]="usuario.cliente.codigo==cliente.codigo ? true : null"&gt;{{cliente.nome}}&lt;/option&gt;              
  &lt;/select&gt;
  </code></pre>
  
  <p>this happen when I try open the component for a new data, if a load the component with a data to edit, does give me any error</p>
  
  <p>Variable in TS file:</p>
  
  <pre><code>@Input() usuario: Usuario = new Usuario();
  </code></pre>