[ui] Fix all "TypeError" QML warnings #1839
Merged
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Description
Some QML properties access exposed Python objects that may or may not be null upon their access. When these objects are accessed while null, QML issues "TypeError" warnings. These warnings have no functional impact as QML correctly handles trying to access null objects, but can spam the logs.
This PR fixes all these warnings by ensuring that the Python objects are not null before they are accessed by QML properties. In case the objects are null, default values are returned instead of still attempting to access them anyway.