Fail to import weather dataset if there is no missing values in the dataset

[jnsebgosselin]

If there is non nan value in the weather dataset, the following error occurs :

Traceback (most recent call last):

  File "C:\Users\User\gwhat\gwhat\meteo\tests\test_read_weather_data.py", line 71, in <module>
    wxdset = WXDataFrame(fmeteo)

  File "C:\Users\User\gwhat\gwhat\meteo\weather_reader.py", line 198, in __init__
    self.__load_dataset__(filename)

  File "C:\Users\User\gwhat\gwhat\meteo\weather_reader.py", line 218, in __load_dataset__
    self.metadata, self.data = read_weather_datafile(filename)

  File "C:\Users\User\gwhat\gwhat\meteo\weather_reader.py", line 394, in read_weather_datafile
    data = np.char.strip(data, ' ')

  File "<__array_function__ internals>", line 6, in strip

  File "C:\Anaconda3\envs\python37\lib\site-packages\numpy\core\defchararray.py", line 1549, in strip
    return _vec_string(a_arr, a_arr.dtype, 'strip', _clean_args(chars))

TypeError: string operation on non-string array