Add alias extraction test for query with no table

Signed-off-by: Michal Čihař <[email protected]>

Author: nijel

tests/Utils/MiscTest.php

@@ -101,6 +101,11 @@ public function getAliasesProvider()
                 null,
                 array()
             ),
+            array(
+                'SELECT 1',
+                null,
+                array()
+            ),
             array(
                 'SELECT * FROM orders AS ord WHERE 1',
                 'db',