Exception in dardar_cloud when file for specific time step does not exist

[JuliaKukulies]

When you want to download a specific date for DARDAR CLOUD from the ICARE server, an exception is raised when the file does not exist. Would be nicer to get a warning and download the file with the closest time to the desired time instead.

from pansat.products.satellite.dardar import dardar_cloud
from datetime import datetime

t_0 = datetime(2016, 11, 20, 0)
t_1 = datetime(2016, 12, 22, 0)

files_dardar = dardar_cloud.download(t_0, t_1)

-> Exception: Can't find product folder SPACEBORNE/MULTI_SENSOR/DARDAR_CLOUD/2016/2016_11_23on the ICARE ftp server. Are you sure this isa ICARE multi sensor product?