Hide buttons and links when there is no record

There is no action to run without a record.

Closes #14250

sao/src/common.js

@@ -959,7 +959,7 @@
             if (record) {
                 states = record.expr_eval(this.attributes.states || {});
             } else {
-                states = {};
+                states = {'invisible': true};
             }
             if (states.invisible) {
                 this.el.hide();

sao/src/view/form.js

@@ -1091,6 +1091,8 @@ function eval_pyson(value){
                 this._current = record.id;
             } else {
                 this._current = null;
+                this.el.hide();
+                return;
             }
             pyson_ctx.context = context;
             this.el.off('click');

tryton/tryton/common/button.py

@@ -32,7 +32,7 @@ class Button(Gtk.Button):
         if record:
             states = record.expr_eval(self.attrs.get('states', {}))
         else:
-            states = {}
+            states = {'invisible': True}
         if states.get('invisible', False):
             self.hide()
         else:

tryton/tryton/gui/window/view_form/view/form_gtk/state_widget.py

@@ -155,6 +155,8 @@ class Link(StateMixin, Gtk.Button):
             context = {}
             pyson_ctx = {}
             self._current = None
+            self.hide()
+            return
         pyson_ctx['context'] = context
         try:
             self.disconnect_by_func(self.__class__.clicked)