Merge branch '424-npe-when-enabling-print-size-of-models-log' into 'master'

do not count instances for actions with type not present in the model

Closes #424

See merge request !312

plugins/fr.irisa.atsyra.absystem.model/src/fr/irisa/atsyra/absystem/model/absystem/util/ABSSizeInfo.java

@@ -103,7 +103,7 @@ public class ABSSizeInfo {
 				for (GuardedAction guardedAction : dg.getGuardedActions()) {
 					int nbInstances = 1;
 					for(GuardParameter param : guardedAction.getGuardParameters()) {
-						nbInstances *= assetInstanceCount.get(param.getParameterType());
+						nbInstances *= assetInstanceCount.getOrDefault(param.getParameterType(),0);
 					}
 					nbGuardedActionInstance += nbInstances;
 				}