Merge pull request #3614 from The-OpenROAD-Project-staging/fix-check-zero-warnings

Fix check in case warning count goes to zero

Author: maliberty

flow/util/checkMetadata.py

@@ -80,6 +80,10 @@ def try_number(string):
 
     if field in metadata.keys():
         build_value = try_number(metadata[field])
+    elif "__warnings__count:" in field:
+        # Metric is a warning count. If the value is missing,
+        # there were zero warnings
+        build_value = 0.0
     else:
         print(f"[ERROR] Value not found for {field}.")
         sys.exit(1)