Download annual data for all reporters

[dauletgali]

Is your feature request related to a problem? Please describe.
I'm always frustrated when I need to download annual data for all reporters. Previously, in the old UNComtrade I was able to download 1 file which contains all reporters all partners for a given year. Now, I need to download more than 100 files for each reporter to get annual data. Moreover, during the downloading process it often fails. I need to find which reporters have been downloaded and which left and re-run the script with reporters that left.

Describe the solution you'd like
A one line of code which returns 1 file with all possible transactions for given year. (HS 6 digit). In the following form (Reporter Partner HS6Code HSclassification Flow Weight Value Unit)

Describe alternatives you've considered
Alternative is run a bulkDownload with parameter: reporter=None and wait and hope for download. Then combine all files to single.

Additional context
Why when I bulk download for 2020, it crashes at any random reporter with issue AttributeError: 'tuple' object has no attribute tb_frame'