修复filter图标显示

app/src/main/java/com/github/tvbox/osc/ui/fragment/GridFragment.java

@@ -295,9 +295,11 @@ public class GridFragment extends BaseLazyFragment {
     }
 
     private void toggleFilterColor() {
+        if (sortData.filters != null && !sortData.filters.isEmpty()) {
             int count = sortData.filterSelectCount();
             EventBus.getDefault().post(new RefreshEvent(RefreshEvent.TYPE_FILTER_CHANGE, count));
         }
+    }
 
     public boolean isTop() {
         return isTop;