Ignore trailing whitespace lines in spl.txt files.

compliance/check.py

@@ -408,6 +408,7 @@ def get_avg_power(power_path: str, run_path: str) -> Tuple[float, float]:
 
         with open(spl_fname) as f:
             for line in f:
+                if not line.startswith("Time"): continue
                 timestamp = (
                     datetime.strptime(line.split(",")[1], datetime_format)
                 ).replace(tzinfo=timezone.utc)