avoid empty names with required

Signed-off-by: Jakob <jakob.roehrl@web.de>

src/components/board/Stack.vue

@@ -48,11 +48,9 @@
 			<label for="new-stack-input-main" class="hidden-visually">Add a new card</label>
 			<input id="new-stack-input-main" v-model="newCardTitle" type="text"
 				class="no-close"
-				placeholder="Add a new card">
+				placeholder="Add a new card" required>
 
-			<input v-tooltip="{content: missingCardName, show: !addNewCardValidation, trigger: 'manual' }"
-				:disabled="!addNewCardValidation"
-				class="icon-confirm"
+			<input class="icon-confirm"
 				type="submit"
 				value="">
 		</form>
@@ -87,20 +85,12 @@ export default {
 		return {
 			editing: false,
 			copiedStack: '',
-			newCardTitle: '',
-			missingCardName: t('deck', 'card title must be provided')
+			newCardTitle: ''
 		}
 	},
 	computed: {
 		cardsByStack() {
 			return (id) => this.$store.getters.cardsByStack(id)
-		},
-		addNewCardValidation() {
-			if (this.newCardTitle === '') {
-				return false
-			}
-
-			return true
 		}
 	},