fix bug

@@ -79,18 +79,24 @@ class BSWorkbook(Workbook):
         # }
 
         # 第一行关键词
-        find_count = 0
+        header_col_list = []
         for first_row in ws.iter_rows(max_row=1, min_row=1, values_only=True):
             sheet_header_info.setdefault(ws.title, {}).setdefault(consts.HEADER_KEY, first_row)
             for idx, header_value in enumerate(first_row):
                 header_col = self.get_header_col(header_value, classify)
                 if header_col is not None:
-                    find_count += 1
-                    sheet_header_info.setdefault(ws.title, {}).setdefault(header_col, idx)
-                    find_col_set = sheet_header_info.setdefault(ws.title, {}).setdefault(consts.FIND_COL_KEY, set())
-                    find_col_set.add(idx)
-                    col_count = header_info.setdefault(header_col, {}).get(idx)
-                    header_info.setdefault(header_col, {})[idx] = 1 if col_count is None else col_count+1
+                    header_col_list.append((idx, header_col))
+
+        find_count = len(header_col_list)
+        if find_count < 2:
+            find_count = 0
+        else:
+             for idx, header_col in header_col_list:
+                sheet_header_info.setdefault(ws.title, {}).setdefault(header_col, idx)
+                find_col_set = sheet_header_info.setdefault(ws.title, {}).setdefault(consts.FIND_COL_KEY, set())
+                find_col_set.add(idx)
+                col_count = header_info.setdefault(header_col, {}).get(idx)
+                header_info.setdefault(header_col, {})[idx] = 1 if col_count is None else col_count+1
 
         sheet_header_info.setdefault(ws.title, {}).setdefault(consts.FIND_COUNT_KEY, find_count)
         min_row = 1 if find_count == 0 else 2