Fix an "strpos(): Empty needle" warning

Signed-off-by: Cyrille TOULET <cyrille.toulet@linux.com>

system/core/URI.php

@@ -205,14 +205,17 @@ protected function _parse_request_uri()
 		$query = isset($uri['query']) ? $uri['query'] : '';
 		$uri = isset($uri['path']) ? $uri['path'] : '';
 
-		if (!empty($_SERVER['SCRIPT_NAME']) && strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)
-		{
-			$uri = (string) substr($uri, strlen($_SERVER['SCRIPT_NAME']));
-		}
-		elseif (!empty($_SERVER['SCRIPT_NAME']) && strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)
-		{
-			$uri = (string) substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));
-		}
+        if (isset($_SERVER['SCRIPT_NAME'][0]))
+        {
+            if (strpos($uri, $_SERVER['SCRIPT_NAME']) === 0)
+            {
+                $uri = (string) substr($uri, strlen($_SERVER['SCRIPT_NAME']));
+            }
+            elseif (strpos($uri, dirname($_SERVER['SCRIPT_NAME'])) === 0)
+            {
+                $uri = (string) substr($uri, strlen(dirname($_SERVER['SCRIPT_NAME'])));
+            }
+        }
 
 		// This section ensures that even on servers that require the URI to be in the query string (Nginx) a correct
 		// URI is found, and also fixes the QUERY_STRING server var and $_GET array.