fix: skip blank stages in KR replacement on ResoureUpdater (#13045)

* fix: skip blank stages in KR replacement on ResoureUpdater

* docs: simple commenting

---------

Co-authored-by: Constrat <56174894+Constrat@users.noreply.github.com>

resource/global/YoStarKR/resource/tasks/tasks.json

@@ -1361,8 +1361,7 @@
             ["라인랩가드", "莱茵卫士"],
             ["빙하기", "冰川期"],
             ["울창한정글", "丛林密布"],
-            ["기동대", "机动队"],
-            ["", " "]
+            ["기동대", "机动队"]
         ]
     },
     "BattleQuickFormationFilter-Cost": {

tools/ResourceUpdater/main.cpp

@@ -1316,8 +1316,13 @@ bool ocr_replace_overseas(const fs::path& input_dir, const fs::path& tasks_base_
             }
 
             name_buffer = stage_obj["name"].as_string();
+            // ko-kr requires space removal
             if (remove_spaces) {
                 name_buffer.erase(std::remove(name_buffer.begin(), name_buffer.end(), ' '), name_buffer.end());
+                // ro4_b_9 is blank for all clients so we skip it
+                if (name_buffer.empty()) {
+                    continue;
+                }
             }
             stage_names.emplace(id, name_buffer);
         }