Block Grid: Configure minimum one column for areas (#20363)

Configure minimum 1 column for areas in block grid

Author: bjarnef

src/Umbraco.Web.UI.Client/src/packages/block/block-grid/workspace/views/block-grid-type-workspace-view-areas.element.ts

@@ -22,7 +22,7 @@ export class UmbBlockGridTypeWorkspaceViewAreasElement extends UmbLitElement imp
 				await context?.propertyValueByAlias<undefined | string>('gridColumns'),
 				(value) => {
 					const dataTypeGridColumns = value ? parseInt(value, 10) : 12;
-					this._areaColumnsConfigurationObject = [{ alias: 'placeholder', value: dataTypeGridColumns }];
+					this._areaColumnsConfigurationObject = [{ alias: 'placeholder', value: dataTypeGridColumns }, { alias: 'min', value: 1 }];
 					this._areaConfigConfigurationObject = [{ alias: 'defaultAreaGridColumns', value: dataTypeGridColumns }];
 				},
 				'observeGridColumns',