Warn if log_dir in result.json does not exist

result_parser.py

 """Parse quic-interop-runner result.json files."""
 
 import json
+import logging
 import re
 from abc import ABC, abstractmethod
 from dataclasses import dataclass
@@ -300,10 +301,16 @@ class Result:
     def log_dir(self) -> Path:
         """The path to the detailed logs."""
         log_dir = Path(self.raw_data["log_dir"])
-        if log_dir.is_absolute():
+
+        if not log_dir.is_absolute():
+            log_dir = self.file_path.parent / log_dir
+
+        if not log_dir.is_dir():
+            logging.warning(
+                f"The log dir {log_dir} given in {self.file_path} does not exist"
+            )
+
         return log_dir
-        else:
-            return self.file_path.parent / log_dir
 
     @log_dir.setter
     def log_dir(self, value: Path):