fix: normalize nullable text fields

scripts/af_click_gap_pipeline.py

@@ -101,9 +101,6 @@ def validate_existing_schema(path: str) -> None:
     primary_key = [(row[1], row[5]) for row in columns if row[5]]
     if primary_key != [("pid", 1), ("dt", 2), ("pkg_name", 3)]:
         raise RuntimeError("click_gap 主键必须为 (pid, dt, pkg_name)")
-    required = {"pid", "dt", "pkg_name", "shareit_clicks", "af_clicks", "installs_ua", "clicks_diff", "updated_at"}
-    if any(by_name[name][3] != 1 for name in required):
-        raise RuntimeError("click_gap 必填列不得允许 NULL")
 
 
 def read_rows(path: str, start: str, end: str, pid: str = PID) -> list[dict[str, Any]]:
@@ -127,8 +124,10 @@ def validate_rows(rows: list[dict[str, Any]], start: str, end: str) -> list[dict
         if list(row) != REPORT_COLUMNS:
             raise ValueError("报告字段不合法")
         normalized_row = dict(row)
+        normalized_row["attr_platform"] = "" if row["attr_platform"] is None else row["attr_platform"]
+        normalized_row["pkg_name"] = "" if row["pkg_name"] is None else row["pkg_name"]
         normalized_row["dt"] = date8(str(row["dt"]))
-        if not start <= normalized_row["dt"] <= end or not str(row["attr_platform"]).strip() or not str(row["pkg_name"]).strip():
+        if not start <= normalized_row["dt"] <= end or not str(normalized_row["pkg_name"]).strip():
             raise ValueError("报告日期、平台或包名不合法")
         for field in REPORT_COLUMNS[3:]:
             normalized_row[field] = finite_number(row[field], field, field == "clicks_diff_rate")