Martin Dobias 1c877f116c Fix another crash with rule-based labeling + data-defined properties (fixes #13453)
The writing of data-defined properties to XML was using invalid data.
Also fixes a possible memory leak in assignment operator.
Thanks Nyall for help tracking it down!

This code has been funded by Tuscany Region (Italy) - SITA (CIG: 63526840AE) and commissioned to Gis3W s.a.s.
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