Hello Everyone
I work on Alfresco 5.2.6, SDK4 with Activiti.
When I start a workflow:
1 - Click on 1 to open a user form search.
2 - Write LEGRAND
3 - Click on search.
There are 2 users found. One user does not have email, I want to exclude him from the research

The form is defined in META-INF/share-config-custom.xml:
<alfresco-config>
<!-- Wokflow -->
<config evaluator="string-compare" condition="activiti$partagerEnLecture">
<forms>
<form>
<field-visibility>
<show id="bpm:workflowDescription" />
<show id="girpelwf:collaborateurLecteur" />
<show id="packageItems" />
</field-visibility>
<appearance>
<set id="" appearance="title" label-id="workflow.set.general" />
<set id="personne" appearance="title" label="Personne assignée" />
<set id="items" appearance="title" label-id="workflow.set.items" />
<field id="bpm:workflowDescription" label-id="workflow.field.message">
<control template="/org/alfresco/components/form/controls/textarea.ftl">
<control-param name="style">width: 95%</control-param>
</control>
</field>
<field id="girpelwf:collaborateurLecteur" set="personne" label-id="workflow.partagerEnLecture.collaborateurLecteur" />
<field id="packageItems" set="items">
<control template="partagerEnLecture/components/form/controls/packageitemsPELstartTask.ftl">
<control-param name="startLocation">/app:company_home/st:sites</control-param>
</control>
</field>
</appearance>
</form>
</forms>
</config>The user form search is defined with : <set id="personne" appearance="title" label="Personne assignée" />
What to do to exclude user without email from the search ?
Thank's you
Best regards