only execute if we have proper values

src/Umbraco.Web.UI.Client/src/packages/core/content/workspace/content-detail-workspace-base.ts

@@ -193,6 +193,10 @@ export abstract class UmbContentDetailWorkspaceContextBase<
 		this.variantOptions = mergeObservables(
 			[this.varies, this.variesByCulture, this.variesBySegment, this.variants, this.languages, this._segments],
 			([varies, variesByCulture, variesBySegment, variants, languages, segments]) => {
+				if (varies === undefined) return;
+				if (variesByCulture === undefined) return;
+				if (variesBySegment === undefined) return;
+
 				// No variation
 				if (!varies) {
 					return [