Return noTarget if the valuePath target a non existing object

[thomaspoignant]

Following issue #42, this PR avoids the library to crash if we filter on a target that is undefined.

The RFC specify :

o If the target location is a complex multi-valued attribute with a
value selection filter ("valuePath") and a specific sub-attribute
(e.g., "addresses[type eq "work"].streetAddress"), the matching
sub-attribute of all matching records is replaced.

o If the target location is a multi-valued attribute for which a
value selection filter ("valuePath") has been supplied and no
record match was made, the service provider SHALL indicate failure
by returning HTTP status code 400 and a "scimType" error code of
"noTarget".

You will now receive a NoTarget exception if you try to do a filter on a non-existing target.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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