No value chips when empty string (#37)

* WIP on changing empty text chips to text no value chips

* Changed so translatable

* changed to computed property noValueLabel

paper-autocomplete-chips.html

@@ -194,6 +194,11 @@
 					type: Boolean
 				},
 
+				noValueLabel: {
+					type: String,
+					computed: '_("No value", t)'
+				},
+
 				/**
 				 * `<paper-autocomplete>` `queryFn`
 				 */
@@ -210,13 +215,13 @@
 										return;
 									}
 									return {
-										text: textValue.toString(),
+										text: textValue.toString() === '' ? this.noValueLabel : textValue.toString(),
 										value: item
 									};
 								}
 								const objText = item.toString();
 								return {
-									text: objText,
+									text: objText === '' ? this.noValueLabel : objText,
 									value: objText
 								};
 							},
@@ -350,6 +355,7 @@
 
 			};
 		}
+
 		/**
 		 * Clear the selected items.
 		 * @param {object} event Polymer event object.
@@ -373,10 +379,11 @@
 		 * @returns {void}
 		 */
 		_getChipText(item, textProperty) {
-			if (typeof item === 'object') {
-				return this.get(textProperty, item) || item.text;
+			let localItem = item;
+			if (typeof text === 'object') {
+				localItem = this.get(textProperty, localItem) || localItem.text;
 			}
-			return item;
+			return localItem !== '' ? localItem : this.noValueLabel;
 		}
 		/**
 		 * Update the selected items and request handle of suggestions.