UI: Show filters and hide mount attribution when child clients only (#28357)

ui/app/components/clients/page/counts.hbs

@@ -36,7 +36,7 @@
       </Hds::Alert>
     {{/if}}
 
-    {{#if (or @mountPath this.mountPaths)}}
+    {{#if (or @namespace this.namespaces @mountPath this.mountPaths)}}
       <Hds::Text::Display @tag="p">
         Filters
       </Hds::Text::Display>

ui/app/components/clients/page/counts.ts

@@ -131,7 +131,7 @@ export default class ClientsCountsPageComponent extends Component<Args> {
 
   // namespace list for the search-select filter
   get namespaces() {
-    return this.args.activity.byNamespace
+    return this.args.activity?.byNamespace
       ? this.args.activity.byNamespace
           .map((namespace) => ({
             name: namespace.label,

ui/app/components/clients/page/overview.hbs

@@ -21,10 +21,12 @@
     @responseTimestamp={{@activity.responseTimestamp}}
     @isSecretsSyncActivated={{this.flags.secretsSyncIsActivated}}
   />
-  <Clients::Attribution
-    @noun="mount"
-    @attribution={{this.namespaceMountAttribution}}
-    @responseTimestamp={{@activity.responseTimestamp}}
-    @isSecretsSyncActivated={{this.flags.secretsSyncIsActivated}}
-  />
+  {{#if this.namespaceMountAttribution}}
+    <Clients::Attribution
+      @noun="mount"
+      @attribution={{this.namespaceMountAttribution}}
+      @responseTimestamp={{@activity.responseTimestamp}}
+      @isSecretsSyncActivated={{this.flags.secretsSyncIsActivated}}
+    />
+  {{/if}}
 {{/if}}