Ensure a behave resource exists as attribute in the behave context.
    If this is not the case, the attribute is created by using the default_value.

def ensure_context_attribute_exists(context, name, default_value=None):
    """
    Ensure a behave resource exists as attribute in the behave context.
    If this is not the case, the attribute is created by using the default_value.
    """
    if not hasattr(context, name):
        setattr(context, name, default_value)