Fix string inputs handling

apps/client/src/app/components/admin-market-data/asset-profile-dialog/asset-profile-dialog.component.ts

@@ -575,13 +575,13 @@ export class GfAssetProfileDialogComponent implements OnInit {
       assetClass: this.assetProfileForm.controls.assetClass.value ?? undefined,
       assetSubClass:
         this.assetProfileForm.controls.assetSubClass.value ?? undefined,
-      comment: this.assetProfileForm.controls.comment.value ?? undefined,
+      comment: this.assetProfileForm.controls.comment.value || undefined,
       currency: this.assetProfileForm.controls.currency.value ?? undefined,
       isActive: isBoolean(this.assetProfileForm.controls.isActive.value)
         ? this.assetProfileForm.controls.isActive.value
         : undefined,
-      name: this.assetProfileForm.controls.name.value ?? undefined,
-      url: this.assetProfileForm.controls.url.value ?? undefined
+      name: this.assetProfileForm.controls.name.value || undefined,
+      url: this.assetProfileForm.controls.url.value || undefined
     };
 
     try {