Fix empty text property and empty string

__tests__/html.js

@@ -58,4 +58,35 @@ describe('table', () => {
 })
 
 
-
+describe('gridHeaders', () => {
+
+    describe('Only headers, no url string', () => {
+
+        test(`No headers, no url string`, () => {
+            expect(gridHeaders()).toEqual([]);
+        });
+
+        test('Single header in the array, header item is string, no url string', () => {
+            expect(gridHeaders(['hello'])).toEqual(['hello']);
+        });
+
+        test('Single header in the array, header item is object with text property, no url string', () => {
+            expect(gridHeaders([{ text: 'hello' }])).toEqual(['hello']);
+        })
+
+        test('Single header in the array, header item is object with text property as empty string, no url string', () => {
+            expect(gridHeaders([{ text: '      ' }])).toEqual(['']);
+        })
+
+        test('Single header in the array, header item is an empty object, no url string', () => {
+            expect(gridHeaders([{}])).toEqual(['']);
+        })
+
+    })
+
+
+    describe('Headers and url string', () => {
+        test.todo('')
+    })
+
+})

index.js

@@ -167,13 +167,14 @@ function gridHeaders(headers = [], urlString = '') {
     }
     return headers.map(header => {
         if (isString(header)) {
-            return header;
+            return header.trim();
         }
 
         if (!header.data) {
-            return header.text || header.data || ''
+            return (header.text || header.data || '').trim()
         }
         header.text = header.text || header.data;
+        header.text = header.text.trim();
         if (!header.sort) {
             return header.text;
         }