Fix #446 - bugs in Bief when generating sections

src/app/components/generic-calculator/calculator.component.ts

@@ -712,7 +712,11 @@ export class GenericCalculatorComponent implements OnInit, DoCheck, AfterViewChe
         if (bief.prms.Z1 === bief.calculatedParam) {
             return this.hasResults && ! bief.result.hasErrorMessages();
         } else {
-            return true;
+            // check that linked values are available, if any
+            return (
+                (bief.prms.Z1.valueMode !== ParamValueMode.LINK || bief.prms.Z1.referencedValue.isDefined())
+                && (bief.prms.ZF1.valueMode !== ParamValueMode.LINK || bief.prms.ZF1.referencedValue.isDefined())
+            );
         }
     }
 
@@ -721,7 +725,11 @@ export class GenericCalculatorComponent implements OnInit, DoCheck, AfterViewChe
         if (bief.prms.Z2 === bief.calculatedParam) {
             return this.hasResults && ! bief.result.hasErrorMessages();
         } else {
-            return true;
+            // check that linked values are available, if any
+            return (
+                (bief.prms.Z2.valueMode !== ParamValueMode.LINK || bief.prms.Z2.referencedValue.isDefined())
+                && (bief.prms.ZF2.valueMode !== ParamValueMode.LINK || bief.prms.ZF2.referencedValue.isDefined())
+            );
         }
     }
 
@@ -812,7 +820,12 @@ export class GenericCalculatorComponent implements OnInit, DoCheck, AfterViewChe
                 // do not link Y and If
                 && ! [ "If", "Y" ].includes(p.symbol)
             ) {
-                p.defineReference(bief.section, p.symbol);
+                const bP = bief.section.getParameter(p.symbol);
+                if (bP.valueMode === ParamValueMode.LINK) {
+                    p.defineReference(bP.referencedValue.nub, p.symbol);
+                } else {
+                    p.defineReference(bief.section, p.symbol);
+                }
             }
         }