Empty select is not added to trustedProperties and throws an error, so don't render it

Resources/Private/Partials/Model/Electorate/FormFields/Electors.html

@@ -4,8 +4,15 @@
 			<f:translate key="model.electorate.field.electors">Electors</f:translate>
 		</label>
 		<div class="form-control-wrap" style="max-width: 480px">
+			<f:if condition="{electors}">
+				<f:then>
 			<f:form.select class="form-control" property="electors" options="{electors}" size="3"
 						   optionLabelField="fullName" optionValueField="uid" multiple="true"/>
+				</f:then>
+				<f:else>
+					<f:translate key="model.electorate.field.electors_empty">No electors available.</f:translate>
+				</f:else>
+			</f:if>
 		</div>
 	</div>
 </fieldset>