Fixed #858 - Autocomplete crashes when "field" property is a function

src/components/autocomplete/AutoComplete.d.ts

@@ -3,7 +3,7 @@ import Vue, { VNode } from 'vue';
 declare class AutoComplete extends Vue {
     modelValue?: any;
     suggestions?: any[];
-    field?: string;
+    field?: string|function;
     scrollHeight?: string;
     dropdown?: boolean;
     dropdownMode?: string;

src/components/autocomplete/AutoComplete.vue

@@ -46,7 +46,7 @@ export default {
             default: null
         },
         field: {
-            type: String,
+            type: [String,Function],
             default: null
         },
         scrollHeight: {
@@ -457,7 +457,7 @@ export default {
         },
         inputValue() {
             if (this.modelValue) {
-                if (this.field) {
+                if (this.field && typeof this.modelValue === 'object') {
                     const resolvedFieldData = ObjectUtils.resolveFieldData(this.modelValue, this.field);
                     return resolvedFieldData != null ? resolvedFieldData : this.modelValue;
                 }