feat: fix import_headers_result

lib/tallty_import_export/import.rb

@@ -113,13 +113,17 @@ module TalltyImportExport
     # TODO: 这里，对于import_headers，后面还是不要传参数了
     # 需要合并proc，前端没有办法把proc传过来
     def import_headers_result
-      import_header_hash = import_headers.to_h { |header| [header.with_indifferent_access[:key], header] }.with_indifferent_access
-      @headers.map do |header|
-        key = header[:key]
-        if import_header_hash.dig(key, :proc).present?
-          header[:proc] = import_header_hash.dig(key, :proc)
+      if @headers.present?
+        import_header_hash = import_headers.to_h { |header| [header.with_indifferent_access[:key], header] }.with_indifferent_access
+        @headers.map do |header|
+          key = header[:key]
+          if import_header_hash.dig(key, :proc).present?
+            header[:proc] = import_header_hash.dig(key, :proc)
+          end
+          header
         end
-        header
+      else
+        @headers = import_headers
       end
     rescue
       @headers