feat: do not show tag list in torrent edition is there are no tags

Tags are defined by the admin. If the admin does not define any, the
user cannot add tags to the torrent. The upload form does not show tags
in that case. This commit does the same in the edition form.

pages/torrent/edit/[infoHash].vue

@@ -45,15 +45,17 @@
           </select>
         </div>
       </template>
-      <div>
-        <label for="tags" class="px-2">Tags</label>
-        <TorrustSelect
-          v-model:selected="form.tags"
-          :options="tags.map(entry => ({ name: entry.name, value: entry.tag_id }))"
-          :multiple="true"
-          search
-        />
-      </div>
+      <template v-if="tags?.length > 0">
+        <div>
+          <label for="tags" class="px-2">Tags</label>
+          <TorrustSelect
+            v-model:selected="form.tags"
+            :options="tags.map(entry => ({ name: entry.name, value: entry.tag_id }))"
+            :multiple="true"
+            search
+          />
+        </div>
+      </template>
       <template v-if="user?.username">
         <button
           class="btn btn-primary"
@@ -132,10 +134,10 @@ function getTorrentFromApi (infoHash: string) {
       form.value.title = data.title;
       form.value.description = data.description;
 
-      if (typeof data.category === "object" && "category_id" in data.category) {
-        form.value.category = data.category.category_id;
-      } else {
+      if (data.category === null) {
         form.value.category = null;
+      } else {
+        form.value.category = data.category.category_id;
       }
 
       form.value.tags = data.tags.map((tag) => {
@@ -154,7 +156,7 @@ function getTorrentFromApi (infoHash: string) {
 }
 
 function formValid () {
-  return form.value.title && (form.value.title + form.value.description) !== (torrent.value.title + torrent.value.description + torrent.value.category.name);
+  return form.value.title && form.value.description;
 }
 
 function submitForm () {