Set structure traitlet to None before assigning new structure #549
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Cherry-picked from #383 by @cpignedoli
Fixes #381
This fixes the setting of self.structure = None when a action button is pressed for an importer ("SMILES" and "import from computer")
Thanks, @danielhollas, I tried self.structure = None just in observe("input_structure") but this does not work still, I keep the modification also in that observe.
TODO(DH): Need to test this