refactor : do not create a Nub to get results units

refs #590

src/app/services/formulaire.service.ts

@@ -58,6 +58,7 @@ import { FormulaireEspece } from "../formulaire/definition/form-espece";
 import { FormulairePrebarrage } from "../formulaire/definition/form-prebarrage";
 import { ServiceFactory } from "./service-factory";
 import { FormulairePressureLoss } from "app/formulaire/definition/form-pressureloss";
+import { getNubResultUnit } from "jalhyd";
 
 @Injectable()
 export class FormulaireService extends Observable {
@@ -194,7 +195,7 @@ export class FormulaireService extends Observable {
      * Returns variable name and unit from symbol
      * @param calcType
      * @param symbol
-     * @param forceUnit if given, will be used as nuit
+     * @param forceUnit if given, will be used as unit
      */
     public expandVariableNameAndUnit(calcType: CalculatorType, symbol: string, forceUnit?: string): string {
         let s = this.expandVariableName(calcType, symbol);
@@ -217,16 +218,8 @@ export class FormulaireService extends Observable {
         if (forceUnit) {
             unit = forceUnit;
         } else {
-            // create dummy Nub from CalcType just to get results units
-            let dummyNub: Nub;
-            try {
-                dummyNub = Session.getInstance().createNub(new Props({ "calcType": calcType }));
-            } catch (e) {
-                // silent fail
-            }
-            if (dummyNub?.resultsUnits && dummyNub.resultsUnits[symbol]) {
-                unit = dummyNub.resultsUnits[symbol];
-            } else {
+            unit = getNubResultUnit(calcType, symbol);
+            if (unit === undefined) {
                 // last chance: if unit cannot be read in model, use translation files
                 const unitKey = "UNIT_" + symbolBase;
                 if (langCache && langCache[unitKey] !== undefined) {