Update property-metadata-binding-f5aa4bb.md

[schlak]

Adds the binding procedure of a property that doesn't occur in the default model

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[KvM2]

Hi @schlak , thanks for your contribution. We appreciate it and will look into this.

[KlattG]

Fixed from UI5 1.117

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[schlak]

https://people.sap.com/jschlak