[Backport to release 1.7] Fix a bug in the insertion of a yaml inside another label at a given path

vladimir braquetrequested to merge
backport/fix_bug_valuesfrom_path into release-1.3-sylva-1.7

What it does

Backport of !620 (merged) in release for Sylva 1.7

References

Closes #102 (closed)

Edited by vladimir braquet

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