Task/refactor double ternary in portfolio proportion chart (#7785)

Refactoring

libs/ui/src/lib/portfolio-proportion-chart/portfolio-proportion-chart.component.ts

@@ -397,11 +397,13 @@ export class GfPortfolioProportionChartComponent
                         context.dataIndex
                       ] as string;
 
-                      return value > 0
+                      if (value <= 0) {
-                        ? isUUID(symbol)
+                        return '';
-                          ? (this.data[symbol]?.name ?? symbol)
+                      }
-                          : symbol
+
-                        : '';
+                      return isUUID(symbol)
+                        ? (this.data[symbol]?.name ?? symbol)
+                        : symbol;
                     },
                     offset: 8
                   }