Description:
------------
The current time is not populated when a DateTime object is created by createFromFormat with a format pattern that has no time part defined.


Given the following code:
var_dump(DateTimeImmutable::createFromFormat('Y-m-d', '2020-09-04'));

Output from 8.0.0beta2 and before:
object(DateTimeImmutable)#1 (3) {
  ["date"]=>
  string(26) "2020-09-04 10:28:48.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Europe/Amsterdam"
}

Output from 8.0.0beta3:
object(DateTimeImmutable)#1 (3) {
  ["date"]=>
  string(26) "2020-09-04 00:00:00.000000"
  ["timezone_type"]=>
  int(3)
  ["timezone"]=>
  string(16) "Europe/Amsterdam"
}

Test script:
---------------
<?php

var_dump(DateTimeImmutable::createFromFormat('Y-m-d', '2020-09-04')->format('His') > 0);

Expected result:
----------------
bool(true)

Actual result:
--------------
bool(false)