Ignore Trigger votes section in reply dialog when no permission

When user has no permission to change any trigger vote, we showed
trigger votes section with information that user don't have permission
to vote. It is not very useful, so we rather remove this section
completly when user don't have permission.

Before: https://imgur.com/a/aKM72ll
After: section is removed.

Release-Notes: skip
Google-Bug-Id: b/260837809
Change-Id: I31e5f908e9805040b91d100485eb5bde9f6a0a81
diff --git a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
index 873e6ce..3a83fa1 100644
--- a/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
+++ b/polygerrit-ui/app/elements/change/gr-label-scores/gr-label-scores.ts
@@ -5,7 +5,7 @@
  */
 import '../gr-label-score-row/gr-label-score-row';
 import '../../../styles/shared-styles';
-import {LitElement, css, html} from 'lit';
+import {LitElement, css, html, nothing} from 'lit';
 import {customElement, property} from 'lit/decorators.js';
 import {
   ChangeInfo,
@@ -107,8 +107,7 @@
         label => !this.permittedLabels || this.permittedLabels[label.name]
       ).length === 0
     ) {
-      return html`<h3 class="heading-4">Trigger Votes</h3>
-        <div class="permissionMessage">You don't have permission to vote</div>`;
+      return nothing;
     }
     return html`<h3 class="heading-4">Trigger Votes</h3>
       ${this.renderLabels(labels)}`;