fix warning

src/auth.php

@@ -10,16 +10,13 @@ function login()
     }
 }
 
+session_start();
+
 if (isset($_POST['logout']))
 {
-    if (session_id() != "")
-    {
-        session_destroy();
-    }
+    unset($_SESSION['token']);
 }
 
-session_start();
-
 if (isset($_POST['user']) && isset($_POST['password']))
 {
     login();

src/common.php

@@ -72,6 +72,11 @@ function get_struct($dir, $line)
 function read_tsv($dir, $path)
 {
      
+    if (!is_file($path))
+    {
+        return [];
+    }
+
     $lines = explode("\n", file_get_contents($path));
 
     $shares = [];