Ensure block values aren't null before attempting to process them on removal (#19645)

Ensure block values aren't null before attempting to process them on removal.

Co-authored-by: Niels Lyngsø <[email protected]>

Author: AndyButland

src/Umbraco.Web.UI.Client/src/packages/block/block/property-value-resolver/block-value-resolver.api.ts

@@ -15,13 +15,13 @@ export abstract class UmbBlockValueResolver<ValueType>
 		valuesCallback: (values: Array<UmbBlockDataValueModel>) => Promise<Array<UmbBlockDataValueModel> | undefined>,
 	) {
 		const contentData = await Promise.all(
-			value.contentData?.map(async (entry) => ({
+			(value.contentData ?? []).map(async (entry) => ({
 				...entry,
 				values: (await valuesCallback(entry.values)) ?? [],
 			})),
 		);
 		const settingsData = await Promise.all(
-			value.settingsData?.map(async (entry) => ({
+			(value.settingsData ?? []).map(async (entry) => ({
 				...entry,
 				values: (await valuesCallback(entry.values)) ?? [],
 			})),