[IMP] web_editor: hide the Powerbox when no commands are found

When no command is found in the Powerbox, the text "No results" is
shown, which is annoying. Instead, this hides the Powerbox we such is
the case.

task-2802749

Part-of: odoo/odoo#87209

addons/web_editor/static/lib/odoo-editor/src/powerbox/Powerbox.js

@@ -42,14 +42,8 @@ export class Powerbox {
         clearTimeout(this._renderingTimeout);
         this._hoverActive = false;
 
+        this._mainWrapperElement.classList.toggle('oe-commandbar-noResult', commands.length === 0);
         if (commands.length === 0) {
-            const groupWrapperEl = document.createElement('div');
-            groupWrapperEl.className = 'oe-commandbar-groupWrapper';
-            const groupNameEl = document.createElement('div');
-            groupNameEl.className = 'oe-commandbar-noResult';
-            groupWrapperEl.append(groupNameEl);
-            this._mainWrapperElement.append(groupWrapperEl);
-            groupNameEl.innerText = this.options._t('No results');
             return;
         }
 

addons/web_editor/static/lib/odoo-editor/src/style.css

@@ -224,7 +224,7 @@
     margin: 5px 12px;
 }
 .oe-commandbar-noResult {
-    font-size: 15px;
+    display: none;
 }
 
 .oe-commandbar-commandWrapper {