[bfss] Make ``current_fs_path`` return None when an attribute has no value
current_fs_path was returning the future fspath when no value was defined.
* This does not make any sense
* This tricks the storage into believing that updating the attribute content is
not necessary. The file was written but the attributes was not updated. as a
result the assignement was not made.
(close #1725446)
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"""server side objects
"""