Only check if OCA_RUNBOT exists, not its value.

base_contact/__init__.py

@@ -27,6 +27,6 @@ import os
 _logger = logging.getLogger(__name__ + ".deprecated")
 
 # Skip warnings on runbots
-_method = _logger.info if os.environ.get("OCA_RUNBOT") else _logger.warning
+_method = _logger.info if "OCA_RUNBOT" in os.environ else _logger.warning
 _method("This module is DEPRECATED. See %s/README.rst.",
         os.path.dirname(__file__))