Is your feature request related to a problem? Please describe.

Currently, when printing an `ExchangeObject` it shows
print(data)
{}

even though there are data.weights :

len(data.weights)
Out[16]: 148

Describe the solution you'd like
Improve ExchangeObject printing and summary to not show empty dict even though data is there.

Describe alternatives you've considered
n/a

Additional context
n/a