Merge branch 'develop' of git://github.com/EllisLab/CodeIgniter into develop
diff --git a/system/libraries/Cache/drivers/Cache_file.php b/system/libraries/Cache/drivers/Cache_file.php
index 6c37e70..2a89faf 100644
--- a/system/libraries/Cache/drivers/Cache_file.php
+++ b/system/libraries/Cache/drivers/Cache_file.php
@@ -107,7 +107,14 @@
 	 */
 	public function delete($id)
 	{
-		return unlink($this->_cache_path.$id);
+		if (file_exists($this->_cache_path.$id))
+		{
+			return unlink($this->_cache_path.$id);
+		}
+		else
+		{
+			return FALSE;
+		}
 	}
 
 	// ------------------------------------------------------------------------
@@ -192,4 +199,4 @@
 // End Class
 
 /* End of file Cache_file.php */
-/* Location: ./system/libraries/Cache/drivers/Cache_file.php */
\ No newline at end of file
+/* Location: ./system/libraries/Cache/drivers/Cache_file.php */
diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 28a3d17..c8cb854 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -138,6 +138,7 @@
 	 * Initialize the Email Data
 	 *
 	 * @access	public
+	 * @param	bool
 	 * @return	void
 	 */
 	public function clear($clear_attachments = FALSE)
diff --git a/user_guide/changelog.html b/user_guide/changelog.html
index 17f89a3..f555159 100644
--- a/user_guide/changelog.html
+++ b/user_guide/changelog.html
@@ -115,6 +115,7 @@
 
 <h3>Bug fixes for 2.1.0</h3>
 <ul>
+	<li class="reactor">Unlink raised an error if cache file did not exist when you try to delete it.</li>
 	<li class="reactor">Fixed #378 Robots identified as regular browsers by the User Agent class.</li>
 	<li class="reactor">If a config class was loaded first then a library with the same name is loaded, the config would be ignored.</li>
 	<li class="reactor">Fixed a bug (Reactor #19) where 1) the 404_override route was being ignored in some cases, and 2) auto-loaded libraries were not available to the 404_override controller when a controller existed but the requested method did not.</li>