issue #2164 updated & fixed bugs on batch manager

Added dark mode for unit mode
Templatized filter block for both unit and global mode
Optimized JS functions and added extensibility for unit mode
Modified images.setInfo method so unit mode could save orphan images
Fixed a bug where php would break if filter selection was empty in unit mode

include/ws_functions/pwg.images.php

@@ -29,6 +29,18 @@ function ws_add_image_category_relations($image_id, $categories_string, $replace
   $rank_on_category = array();
   $search_current_ranks = false;
 
+  if (empty($categories_string)) {
+    if ($replace_mode) {
+      $query = '
+DELETE
+  FROM '.IMAGE_CATEGORY_TABLE.'
+  WHERE image_id = '.$image_id.'
+;';
+      pwg_query($query);
+      update_category([]);
+    }
+    return true;
+  }
   $tokens = explode(';', $categories_string);
   foreach ($tokens as $token)
   {
@@ -57,9 +69,16 @@ function ws_add_image_category_relations($image_id, $categories_string, $replace
 
   if (count($cat_ids) == 0)
   {
-    return new PwgError(500,
-      '[ws_add_image_category_relations] there is no category defined in "'.$categories_string.'"'
-      );
+    if ($replace_mode) {
+      $query = '
+DELETE
+  FROM '.IMAGE_CATEGORY_TABLE.'
+  WHERE image_id = '.$image_id.'
+;';
+      pwg_query($query);
+      update_category([]);
+    }
+    return true;
   }
 
   $query = '
@@ -157,6 +176,7 @@ SELECT category_id, MAX(`rank`) AS max_rank
 
   include_once(PHPWG_ROOT_PATH.'admin/include/functions.php');
   update_category($new_cat_ids);
+  return true;
 }
 
 /**