Hide Caching link if directory not defined

qa-include/Q2A/Storage/CacheManager.php

@@ -34,14 +34,15 @@ class Q2A_Storage_CacheManager
 	 */
 	private function __construct()
 	{
-		$optEnabled = qa_opt('caching_enabled') == 1;
+		if (qa_opt('caching_enabled') != 1)
+			return;
 
 		$config = array(
 			'dir' => defined('QA_CACHE_DIRECTORY') ? QA_CACHE_DIRECTORY : null,
 		);
 
 		$this->cacheDriver = new Q2A_Storage_FileCache($config);
-		$this->enabled = $optEnabled && $this->cacheDriver->isEnabled();
+		$this->enabled = $this->cacheDriver->isEnabled();
 	}
 
 	/**

qa-include/Q2A/Storage/FileCache.php

@@ -35,9 +35,7 @@ class Q2A_Storage_FileCache
 	 */
 	public function __construct($config)
 	{
-		if (!isset($config['dir']))
-			return;
-
+		if (isset($config['dir'])) {
 			$this->cacheDir = realpath($config['dir']);
 
 			if (!is_writable($this->cacheDir)) {
@@ -46,6 +44,9 @@ class Q2A_Storage_FileCache
 				// check the folder is outside the public root - checks against server root and Q2A root, in order to handle symbolic links
 				$this->error = qa_lang_html_sub('admin/caching_dir_public', $this->cacheDir);
 			}
+		} else {
+			$this->error = qa_lang_html('admin/caching_dir_missing');
+		}
 
 		$this->enabled = empty($this->error);
 	}

qa-include/app/admin.php

@@ -341,10 +341,12 @@
 				'url' => qa_path_html('admin/spam'),
 			);
 
+			if (defined('QA_CACHE_DIRECTORY')) {
 				$navigation['admin/caching']=array(
 					'label' => qa_lang_html('admin/caching_title'),
 					'url' => qa_path_html('admin/caching'),
 				);
+			}
 
 			$navigation['admin/stats']=array(
 				'label' => qa_lang_html('admin/stats_title'),