[NAB-375] Variables with no init values referenced in arcs will cause arcs not to load

- arcs which referenced data has non integer value will be displayed/represented with value 0 in edit + simulation mode

Author: camperko

src/app/modeler/services/model/model.service.ts

@@ -483,8 +483,10 @@ export class ModelService {
         const referencedData = model.getData(id);
         if (referencedData) {
             if (referencedData.init.value) {
-                return Number(referencedData.init.value);
-                // TODO: NAB-326 check if isFinite and >= 0
+                if (/^[1-9]\d*$/.test(referencedData.init.value.trim())) {
+                    return Number(referencedData.init.value);
+                }
+                return 0;
             }
             return 0;
         }

src/app/modeler/simulation-mode/simulation-mode.service.ts

@@ -87,7 +87,13 @@ export class SimulationModeService extends CanvasModeService<SimulationTool> {
         this.originalModel = new BehaviorSubject<PetriNet>(this.modelService.model.clone());
         this.originalModel.subscribe(model => {
             this.data = new Map(model.getArcs().filter(a => !!a.reference && !!model.getData(a.reference))
-                .map(a => [a.reference, Number.parseInt(model.getData(a.reference).init?.value, 10) || 0]));
+                .map(a => {
+                    const data = model.getData(a.reference);
+                    if (!!data.init && !!data.init.value && /^[1-9]\d*$/.test(data.init.value)) {
+                        return [a.reference, Number.parseInt(data.init.value, 10)];
+                    }
+                    return [a.reference, 0];
+                }));
             this.simulation = new BasicSimulation(model, this.data);
             this.renderModel(model);
         });