Problem with the validation

[gerardp]

Hi
I have a problem with the library (version 1.0.1)
For example, in a input text field, when, at the first time i write a sentence and then i delete it, it shows correctly the error, but then i write again a sentence, delete it (shows the error), and i write again but now never hides the error

           <div class="col-md-3">
              <div class="form-group">
                <label once-text="'Name'|translate"></label><span class="red-dot"> *</span>
                <textarea msd-elastic name="nom" id="nom" class="form-control" style="height:34px;" ng-model="params.expExp.nom"
                          xt-validate container=".modal-body" msg-required="{{'This field is required'|translate}}" required>
                </textarea>
              </div>
            </div>


angularjs 1.3.18
bootstrap 3.2.0
angular ui 0.13.4