MDL-29462 html_to_text('0') gives '', not '0'.

Conflicts:

	lib/simpletest/testweblib.php

lib/html2text.php

@@ -333,7 +333,7 @@ class html2text
      */
     function html2text( $source = '', $from_file = false, $do_links = true, $width = 75 )
     {
-        if ( !empty($source) ) {
+        if ($source !== '') {
             $this->set_html($source, $from_file);
         }
 

lib/html2text_readme.txt

@@ -53,3 +53,18 @@ Index: lib/html2text.php
  }
 
 -- Tim Hunt 2010-11-02
+
+4 - Make sure html2text does not destroy '0'.
+
+index e2d0dff..9cc213d 100644
+--- a/lib/html2text.php
++++ b/lib/html2text.php
+@@ -335,7 +335,7 @@ class html2text
+      */
+     function html2text( $source = '', $from_file = false, $do_links = true, $wi     {
+-        if ( !empty($source) ) {
++        if ($source !== '') {
+             $this->set_html($source, $from_file);
+         }
+
+-- Tim Hunt 2011-09-21

lib/simpletest/testweblib.php

@@ -136,6 +136,14 @@ class web_test extends UnitTestCase {
         $this->assertEqual("\n\nAll the WORLD’S a stage.", html_to_text('<p>All the <strong>world’s</strong> a stage.</p>'));
     }
 
+    public function test_html_to_text_trailing_whitespace() {
+        $this->assertEqual('With trailing whitespace and some more text', html_to_text("With trailing whitespace   \nand some   more text", 0));
+    }
+
+    public function test_html_to_text_0() {
+        $this->assertIdentical('0', html_to_text('0'));
+    }
+
     public function test_clean_text() {
         $text = "lala <applet>xx</applet>";
         $this->assertEqual($text, clean_text($text, FORMAT_PLAIN));