block finalize if not export done. + some other stuff

Registered by Olivier Mattelaer

we should avoid any call to finalize if we don't have a valid export before.

we should also think for an "auto-tutorial" mode for the cmd.
which Explaining what it's doing and what to do next. (this could be done by an addition logger module.)
we could then add a tutorial mode.

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Complete
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Priority:
Medium
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None
Direction:
Needs approval
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Definition:
New
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Implemented
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Started by
Olivier Mattelaer
Completed by
Olivier Mattelaer

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--> push in v_0_4_3

(?)

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