docs: fix object chips input demo not working when all chips removed

Closes #704

Author: hperrin

packages/site/src/routes/demo/chip-input/_AutocompleteObjects.svelte

@@ -39,7 +39,7 @@
 
     // And we can push our own object containing the text.
     colors.push({
-      id: Math.max(...colors.map((color) => color.id)) + 1,
+      id: colors.length ? Math.max(...colors.map((color) => color.id)) + 1 : 1,
       text: event.detail.text,
     });
     value = '';
@@ -51,7 +51,7 @@
 
     // And we can push our own object containing the text.
     colors.push({
-      id: Math.max(...colors.map((color) => color.id)) + 1,
+      id: colors.length ? Math.max(...colors.map((color) => color.id)) + 1 : 1,
       text: event.detail,
     });
     value = '';

packages/site/src/routes/demo/chip-input/_Objects.svelte

@@ -37,7 +37,7 @@
 
     // And we can push our own object containing the text.
     items.push({
-      id: Math.max(...items.map((tag) => tag.id)) + 1,
+      id: items.length ? Math.max(...items.map((tag) => tag.id)) + 1 : 1,
       text: event.detail.text,
     });
     value = '';