erp5_web_renderjs_ui: implement checkValidity to multicheckbox field because this is required

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_multicheckboxfield_js.js

@@ -155,6 +155,10 @@
           });
       }
       return final_result;
-    }, {mutex: 'changestate'});
+    }, {mutex: 'changestate'})
+
+    .declareMethod('checkValidity', function () {
+      return true;
+    });
 
 }(window, rJS, RSVP, document));
\ No newline at end of file

bt5/erp5_web_renderjs_ui/PathTemplateItem/web_page_module/rjs_gadget_erp5_multicheckboxfield_js.xml

@@ -234,7 +234,7 @@
                   </item>
                   <item>
                       <key> <string>serial</string> </key>
-                      <value> <string>987.27720.31838.45482</string> </value>
+                      <value> <string>987.29075.27892.56422</string> </value>
                   </item>
                   <item>
                       <key> <string>state</string> </key>
@@ -252,7 +252,7 @@
                           </tuple>
                           <state>
                             <tuple>
-                              <float>1603213968.47</float>
+                              <float>1603296350.21</float>
                               <string>UTC</string>
                             </tuple>
                           </state>