Fixes an issue where the label of literal nodes loaded from a graphol project file would get the default 'Empty' text rather than the proper literal value.
This also fixes an issue existing since at least v3.1 where editing and saving the literal value without any change would result in a duplicate label getting generated for the node, and an incompatibility
of the graphol exporter with python 3.10.
Fixes an issue where the label of literal nodes loaded from a graphol project file would get the default 'Empty' text rather than the proper literal value. This also fixes an issue existing since at least v3.1 where editing and saving the literal value without any change would result in a duplicate label getting generated for the node, and an incompatibility of the graphol exporter with python 3.10.