Fix table with null text (#1609)

* Handle null values in table text

* Add test case for null value in table text

* Update CHANGELOG.md

Author: chronospatian

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Unreleased
 
+- Fix null values in table cells rendering as `[object Object]`
+ 
 ### [v0.17.0] - 2025-04-12
 
 - Fix precision rounding issues in LineWrapper

lib/table/utils.js

@@ -360,7 +360,7 @@ export function deepMerge(target, ...sources) {
 
 function deepClone(obj) {
   let result = obj;
-  if (typeof obj == 'object') {
+  if (obj && typeof obj == 'object') {
     result = Array.isArray(obj) ? [] : {};
     for (const key in obj) result[key] = deepClone(obj[key]);
   }

tests/unit/table.spec.js

@@ -23,7 +23,7 @@ describe('utils', () => {
       [{ a: 'hello' }, { a: 'world' }, { a: 'world' }],
       [{}, { a: 'hello' }, { a: 'hello' }],
       [{ a: 'hello' }, undefined, { a: 'hello' }],
-      [undefined, undefined, undefined],
+      [undefined, null, undefined],
       [1, 2, 1],
       [1, {}, 1],
       [{ a: 'hello' }, { a: {} }, { a: 'hello' }],