min_space and min_space_str should be added to the default constructor of rosbag::Recorder, using the old hard-coded values for 1GB, to stop old applications from terminating on newer ROS version.

When not setting those values explicitly the check for free space fails, the recorder terminates and the following error message with an empty string is not helpful:

ROS_ERROR("Less than %s of space free on disk with %s. Disabling recording.", options_.min_space_str.c_str(), bag_.getFileName().c_str());