Do not load validated fields

If the field is not loaded, there is no need to validate it.

sao/src/model.js

@@ -1326,13 +1326,15 @@
             });
         },
         validate: function(fields, softvalidation, pre_validate) {
-            this._check_load(fields);
             var result = true;
             for (var fname in this.model.fields) {
                 var field = this.model.fields[fname];
                 if (fields && !~fields.indexOf(fname)) {
                     continue;
                 }
+                if (!this.get_loaded([fname])) {
+                    continue;
+                }
                 if (field.description.readonly) {
                     continue;
                 }

tryton/tryton/gui/window/view_form/model/record.py

@@ -437,11 +437,12 @@ class Record:
             return ''
 
     def validate(self, fields=None, softvalidation=False, pre_validate=None):
-        self._check_load(fields)
         res = True
         for field_name, field in list(self.group.fields.items()):
             if fields is not None and field_name not in fields:
                 continue
+            if not self.get_loaded([field_name]):
+                continue
             if field.attrs.get('readonly'):
                 continue
             if field_name == self.group.exclude_field: