[FIX] web: warn is show when a client action is a function

Before this commit, if we use some client action like: reload, logout, ...
in the console a warning is show, because the action are function and not
AbstractAction.

After this commit, if the client action is not an function and not
a AbstractAction the warning is show.

X-original-commit: 122b76594aeb2c5d923d13c040c2da2048133aac

addons/web/static/src/js/chrome/action_manager.js

@@ -420,9 +420,6 @@ var ActionManager = Widget.extend({
             console.error("Could not find client action " + action.tag, action);
             return Promise.reject();
         }
-        if (!(ClientAction.prototype instanceof AbstractAction)) {
-            console.warn('The client action ' + action.tag + ' should be an instance of AbstractAction!');
-        }
         if (!(ClientAction.prototype instanceof Widget)) {
             // the client action might be a function, which is executed and
             // whose returned value might be another action to execute
@@ -432,6 +429,9 @@ var ActionManager = Widget.extend({
             }
             return Promise.resolve();
         }
+        if (!(ClientAction.prototype instanceof AbstractAction)) {
+            console.warn('The client action ' + action.tag + ' should be an instance of AbstractAction!');
+        }
 
         var controllerID = _.uniqueId('controller_');