[php-src] Issue #8217: new DateTime("@".$timestamp) should not crash (throws fatal error) with empty timestamp

Issue: https://github.com/php/php-src/issues/8217 Comment Author: cmb69 First, there is no fatal error, but rather an Exception is thrown (https://3v4l.org/JCpa7). Not catching that exception results in a fatal error. Second, a failing constructor *must* throw, because otherwise you would have an uninitialized object.