Improve combine_models function (fedavg.py) to identify the source of the model combining problem (here lack of resources)

[aitmlouk]

Is your feature request related to a problem? Please describe. Improve combine_models function (fedavg.py) to identify the source of the model combining problem (here lack of resources on client-side).

Describe the solution you'd like If clients failed to train models/ or the training process is not finish this will generate and send an empty model to the combiners. Then, combiners will throw errors during model combining among them (FAILED TO UNPACK FROM COMBINER!, ) which is not very useful to identify the source of the problem. Hence, adding more exceptions about the lack of resources will help to quickly identify the issue.

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