Part: make PropertyGeometryList more permissive

[wwmayer]

Since not all Geometry sub-classes fully implement Save() / Restore() raising an exception instead may invalidate a project. To avoid this PropertyGeometryList now explicitly handles NotImplementedError exceptions.

See also: https://forum.freecad.org/viewtopic.php?t=77148

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[freecadci]

for feature branch PR_9081. Pipeline 819110285 was triggered at 7c296aa. All CI branches and pipelines.

[donovaly]

Should/could that be backported?

[wwmayer]

Yes

[donovaly]

Thanks, backported now.