Hotfix: Prevent NPE in some edge cases of the `TypeIndexer`

Echtzeitsysteme / gips

Graph-Based (M)ILP Problem Specification Tool

https://gips.dev

GNU General Public License v3.0

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Closed maxkratz closed 1 year ago

maxkratz commented 1 year ago

In some edge cases, the TypeIndexer produced an NPE.

Example case:

Metamodel with type Root
Root has a reference of another type (e.g., Subnode) with multiplicity 0..1
In the instance object of Root the reference to Subnode is null

This fix (or another one for this bug) is necessary for our incremental P2P example.