Build: check if the YAML file exists before trying to open it

Author: humitos

readthedocs/doc_builder/director.py

@@ -638,6 +638,10 @@ def store_readthedocs_build_yaml(self):
             "readthedocs-build.yaml",
         )
 
+        if not os.path.exists(yaml_path):
+            log.debug("Build output YAML file (readtehdocs-build.yaml) does not exist.")
+            return
+
         try:
             with open(yaml_path, "r") as f:
                 data = yaml.safe_load(f)