fix(miniflux) correct category filter

miniflux_scripts/filter_categories.js

@@ -2,8 +2,8 @@
     'use strict';
 
     document.querySelectorAll('article.item').forEach(function(e) {
-        var total = e.querySelector('span[class="category-item-total"]').innerText == '(0)';
-        if (total) {
+        const totalSpan = e.querySelector('span.category-item-total');
+        if (totalSpan && totalSpan.innerText.trim() === '(0)') {
             e.remove();
         }
     });