write_traffic_situation_to_file.py: exclude fields the value of which…

… is either None or the default value.

src/trafficgen/write_traffic_situation_to_file.py

@@ -19,6 +19,10 @@ def write_traffic_situations_to_json_file(situations: List[Situation], write_fol
     for i, situation in enumerate(situations):
         file_number: int = i + 1
         output_file_path: Path = write_folder / f"traffic_situation_{file_number:02d}.json"
-        data: str = situation.model_dump_json(indent=4)
+        data: str = situation.model_dump_json(
+            indent=4,
+            exclude_defaults=True,
+            exclude_none=True,
+        )
         with open(output_file_path, "w", encoding="utf-8") as outfile:
             outfile.write(data)