Fixes issue #67

This fixes #67 (closed)

Looks like the problem is caused by src/components/user_settings/user_settings.vue, line 13:

<button :disabled='newname.length <= 0' class="btn btn-default" @click="updateProfile">{{$t('general.submit')}}</button>

Checking if newname exists before trying to use .lenght solves the problem.