Felipe Monteiro a3d32c3459 Raise exception on unfound secret in source document
This PS introduces a new exception SubstitutionSourceSecretNotFound
which is raised when a src.path referenced under the substitutions
of a destination document isn't found in the data section of
the corresponding source document if fail_on_missing_sub_src
is True -- else a warning is logged.

Change-Id: If2b08f443cde765a1dbfaf7bac6b549591e59148
2018-04-09 17:04:58 +01:00
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