How to remove empty struct from matlab file in python?

[python_newbie09]

I am new to working with matlab files and I have a problem with some matlab files that has empty structs in between structs that have values. an example of how the file looks like in matlab is shown.

in python my code is as below:

from scipy.io import loadmat

file = 'filepath'
mat_dict = {}
mat = hdf5storage.loadmat(file,matlab_compatible=True)
mat_dict.update(mat)
a = mat_dict['bt']
b = a.shape
print(b)

so for this file the shape return a size of (1,338) which shows 1X1 structs followed by empty structs and then 1X1 structs again towards the end.

I have no idea how to remove these empty structs and combine the ones which has values and hope to get some help here.
Thank you.