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ENH: Catch trajectory attribute error

username-removed-278334 requested to merge morten-j-nagel/ase:catch-trajectory-AttributeError into master

Split from !225 (closed).

Old calculators (e.g. lammpsrun), which are not derived from Calculator, may not have the attribute calculation_required. As a consequence no energies or forces will be written Trajectory files, even if they are available.

This more of a temporary band-aid. I have done some additional work (morten-j-nagel/ase@a41b90d4...3fcdfd87) on lammpsrun, but these changes are very much work in progress. The exciting and fleur calculators are not derived from Calculator and do not have a calculation_required attribute, so it might also help there.

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