FIX: With the new filter_window_polar the filter_cloudtype shuld only receive a float as scale.
FIX: With the new filter_window_polar the filter_cloudtype shuld only receive a float as scale.

Before, the scale argument had to be a tuple, with the new polar filtering, it is
only a float that corresponds to the range scale.

jjhelmus/wradlib,jjhelmus/wradlib