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When I attempt to initialize Ocean for small region, I get an error, if the region does not contain any data. For example, running the below script

from datetime import datetime
from kadlu.geospatial.ocean import Ocean

bounds = dict(
               south=43.5, north=43.6, west=-59.8, east=-59.7,
               start=datetime(2015,1,1), end=datetime(2015,1,2), 
               top=0, bottom=10000
             )
data_sources = dict(load_temp='hycom', load_windspeed='wwiii')
gully = Ocean(**bounds, **data_sources)

results in this error message,

WWIII 2015-01-01 windU: processed and inserted 0 rows. 654921 null values removed, 1360359 duplicates ignored
WWIII 2015-01-01 windV: processed and inserted 0 rows. 654921 null values removed, 1360359 duplicates ignored
Traceback (most recent call last):
  File "test_kadlu.py", line 23, in <module>
    gully = Ocean(**bounds2, **data_sources)
  File "/home/oliskir/src/anaconda3/envs/kadlu_env/lib/python3.7/site-packages/kadlu/geospatial/ocean.py", line 204, in __init__
    for i in interpolations: i.start()
  File "/home/oliskir/src/anaconda3/envs/kadlu_env/lib/python3.7/site-packages/kadlu/geospatial/ocean.py", line 192, in <genexpr>
    columns = (fcn(v=v, data=data, **kwargs) for fcn, v in pipe)
  File "/home/oliskir/src/anaconda3/envs/kadlu_env/lib/python3.7/site-packages/kadlu/geospatial/data_sources/wwiii.py", line 235, in load_wind_uv
    wind_u, lat, lon, epoch, _, wind_v, _, _, _, _ = np.array(db.fetchall()).T
ValueError: not enough values to unpack (expected 10, got 0)

How should we resolve this?