QIFEMPTY: detected empty for all - fixed. Not clear why the unit test not...

QIFEMPTY: detected empty for all - fixed. Not clear why the unit test not failed already. Unit tests checked again that they really work: they do!

extension/Classes/Sql/function.sql

@@ -81,7 +81,7 @@ CREATE FUNCTION QIFEMPTY(input TEXT, token TEXT)
 BEGIN
   DECLARE output TEXT;
   SET output =
-      IF(ISNULL(input) OR input = '' OR input = '0000-00-00' OR input = '0000-00-00 00:00:00', token,
+      IF(ISNULL(input) OR input = '' OR input = '0' OR input = '0000-00-00' OR input = '0000-00-00 00:00:00', token,
          input);
   RETURN output;
 END;

extension/Tests/Unit/Core/Database/DatabaseFunction.php

@@ -65,8 +65,17 @@ class DatabaseFunction extends AbstractDatabaseTest {
     public function testQIfEmpty() {
 
         $this->assertEquals('test', $this->db->sql('SELECT QIFEMPTY("test","-")', ROW_IMPLODE_ALL));
+        $this->assertEquals('<', $this->db->sql('SELECT QIFEMPTY("<","-")', ROW_IMPLODE_ALL));
+
+        $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY(null,"-")', ROW_IMPLODE_ALL));
         $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY("","-")', ROW_IMPLODE_ALL));
+
         $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY("0","-")', ROW_IMPLODE_ALL));
+        $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY(0,"-")', ROW_IMPLODE_ALL));
+
+        $this->assertEquals('1', $this->db->sql('SELECT QIFEMPTY("1","-")', ROW_IMPLODE_ALL));
+        $this->assertEquals('1', $this->db->sql('SELECT QIFEMPTY(1,"-")', ROW_IMPLODE_ALL));
+
         $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY("0000-00-00","-")', ROW_IMPLODE_ALL));
         $this->assertEquals('-', $this->db->sql('SELECT QIFEMPTY("0000-00-00 00:00:00","-")', ROW_IMPLODE_ALL));
     }