[ticket/12536] Add test cases with empty versions list

PHPBB3-12536

tests/version/version_test.php

@@ -181,6 +181,11 @@ class phpbb_version_helper_test extends phpbb_test_case
 					),
 				),
 			),
+			array(
+				'1.1.0',
+				array(),
+				array(),
+			),
 		);
 	}
 
@@ -286,6 +291,11 @@ class phpbb_version_helper_test extends phpbb_test_case
 				),
 				'1.1.0-a2',
 			),
+			array(
+				'1.1.0',
+				array(),
+				null,
+			),
 		);
 	}