fix nulls in text

build.py

@@ -32,7 +32,7 @@ if __name__ == "__main__":
         product_id=pl.col("product_id").cast(pl.String),
         title=pl.col("product_name"),
         text=pl.concat_str(
-            [pl.lit(f"{col}: ") + pl.col(col) for col in COLUMNS],
+            [pl.lit(f"{col}: ") + pl.col(col).fill_null("") for col in COLUMNS],
             separator="\n",
         ),
     )

data/data.jsonl.gz

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:baa81cc07eb4d48cbd7af9bc149733f39837fc99c9a9dc08cbed8376f0cc85e9
-size 117754301
+oid sha256:2d819da2f328b9ab173c3b3df9cfd3b4a04f43e62a4ca22b5fa66ebfa8a5e3f9
+size 120859365