fix: roles error handling on admin ui

src/AdminSettings.vue

@@ -29,6 +29,10 @@
         {{ strings.userRolesHelp }}
       </NcNoteCard>
 
+      <NcNoteCard v-if="rolesError" type="error">
+        {{ rolesError }}
+      </NcNoteCard>
+
       <div class="settings-section-content">
         <div class="user-role-form">
           <div class="field-row">
@@ -111,6 +115,7 @@ export default {
 
       // User roles
       rolesLoading: true,
+      rolesError: null,
       roles: [],
       userId: '',
       selectedRole: null,
@@ -157,10 +162,12 @@ export default {
     async fetchRoles() {
       try {
         this.rolesLoading = true
+        this.rolesError = null
         const resp = await ocs.get('/admin/roles')
         this.roles = resp.data.roles
       } catch (e) {
         console.error('Failed to fetch roles', e)
+        this.rolesError = e.response?.data?.message || t('forum', 'Failed to fetch roles')
       } finally {
         this.rolesLoading = false
       }

src/axios.ts

@@ -16,7 +16,11 @@ ocs.interceptors.response.use(
     if (ocsResponse !== undefined) {
       // Extract data from OCS response, falling back to meta message for errors
       const ocsData = ocsResponse.data
-      if (ocsData !== undefined && ocsData !== null) {
+      const isEmpty =
+        ocsData === undefined ||
+        ocsData === null ||
+        (Array.isArray(ocsData) && ocsData.length === 0)
+      if (!isEmpty) {
         error.response.data = ocsData
       } else if (ocsResponse.meta?.message) {
         // For OCS errors that only have meta message (no data)