Hi Giacomo, the bug log states that the files using gdata have been removed upstream[1]. I'd volunteer to commit this package to Salsa in Debian Science, apply the needed patch and upload as a team upload if you don't mind. If I will not hear from you soon I assume you are fine with the move into Debian Science team.
Kind regards
Andreas.
[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=899007#15
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