Update NST.py

NST.py

@@ -261,6 +261,8 @@ class Nst(datasets.GeneratorBasedBuilder):
                             # Fixing some errors in the metadata
                             if "," in fields["age"]:
                                 fields["age"] = fields["age"].split(",")[0].strip()
+                            if "+" in fields["age"]:
+                                fields["age"] = fields["age"].split("+")[0].strip()
                             if " " in fields["age"].strip():
                                 fields["age"] = fields["age"].strip().split(" ")[0].strip()
                             if fields["age"].lower() in ("slethei", "ramslie") or not fields["age"].strip():