Fix the issue #117

[alkorolyov]

Simple fix for an existing issue with 'morgan' kind in FPVecTransformer (#107)

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Checklist:

• Was this PR discussed in an issue? It is recommended to first discuss a new feature into a GitHub issue before opening a PR.
• Add tests to cover the fixed bug(s) or the new introduced feature(s) (if appropriate).
• Update the API documentation if a new function is added, or an existing one is deleted. Eventually consider making a new tutorial for new features.
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discussion related to that PR

[maclandrol]

Good catch @alkorolyov ! Thanks for the PR

[zhu0619]

Looks good to me!
@alkorolyov Thank you for fixing this!