scan_info "estimation" is not always provided
Only few scans provide this information.
# estimation = scan_info.get('estimation')
# ex: {'total_motion_time': 2.298404048112306, 'total_count_time': 0.1, 'total_time': 2.398404048112306}
I use it now in Flint, then if it could be provided, Flint could display a little more useful information.