Failed to run busybox for ValidationError

Faild to run the busybox test when there is no run option passed or specified in the test definition file
Error information:
ERROR: Test execution error: ValidationError: Object has incorrect type (expected string) object_expr='object.test_runs[0].attributes.run_options', schema_expr='schema.properties.test_runs.items.properties.attributes.additionalProperties.type')

JOB:
http://validation.linaro.org/lava-server/scheduler/job/29515/log_file