Fix validation for definition configs

opmon/cli.py

@@ -425,8 +425,9 @@ def validate_config(path: Iterable[os.PathLike], config_repos, private_config_re
 
         experiment = experiments.with_slug(entity.slug)
         monitor_entire_population = False
-        if "project" in entity.spec and entity.spec.project and entity.spec.project.population:
-            monitor_entire_population = entity.spec.project.population.monitor_entire_population
+        if config_file.parent.name != DEFINITIONS_DIR:
+            if entity.spec.project and entity.spec.project.population:
+                monitor_entire_population = entity.spec.project.population.monitor_entire_population
 
         if config_file.parent.name != DEFINITIONS_DIR and config_file.parent.name != DEFAULTS_DIR:
             if experiment is None and monitor_entire_population is False: