Remove items whose value is None before dumping to JSON (#53)

Some add-on submissions, such as this one are failing.

The problem appears to be that optional values in the JSON metadata are being given a value of null, rather than omitted. Since null is a value, and the datatype for these keys is string, the validation fails.

Thus, remove any None values from the add-on metadata before dumping to JSON. I believe this is safe, as we have already validated that all required keys are present, so any Nones on the dataclass are optional keys that haven't been provided.

Author: SaschaCowley

_validate/createJson.py

@@ -72,7 +72,18 @@ def generateJsonFile(
 	filePath = buildOutputFilePath(data, parentDir)
 
 	with open(filePath, "wt", encoding="utf-8") as f:
-		json.dump(dataclasses.asdict(data), f, indent="\t", ensure_ascii=False)
+		json.dump(
+			dataclasses.asdict(
+				data,
+				# The JSON schema does not permit null values, but does contain optional keys.
+				# We have already ensured that all required keys are present in the metadata,
+				# So we can safely delete all keys whose value is None as optional.
+				dict_factory=lambda args: dict(filter(lambda item: item[1] is not None, args)),
+			),
+			f,
+			indent="\t",
+			ensure_ascii=False,
+		)
 	print(f"Wrote json file: {filePath}")