Account for empty arrays in XMP data #490

Job	Run time
PHPUnit Composer v2 (PHP 7.4)	27s
PHPUnit (PHP 7.2)	19s
PHPUnit (PHP 7.3)	23s
PHPUnit (PHP 7.4)	20s
PHPUnit (PHP 8.0)	20s
PHPUnit (PHP 8.1)	28s
PHPUnit (PHP 8.2)	29s
Tests alternative autoloader (PHP 7.1)	13s
Tests alternative autoloader (PHP 7.2)	8s
Tests alternative autoloader (PHP 7.3)	10s
Tests alternative autoloader (PHP 7.4)	12s
Tests alternative autoloader (PHP 8.0)	7s
Tests alternative autoloader (PHP 8.1)	10s
Tests alternative autoloader (PHP 8.2)	13s
PHPUnit coverage (PHP 7.4)	43s
PHPUnit (PHP 7.1)	18s
PHPUnit lowest deps (PHP 7.3)	18s
Windows-Tests with PHP 7.1	1m 2s
Windows-Tests with PHP 7.2	52s
Windows-Tests with PHP 7.3	38s
Windows-Tests with PHP 7.4	50s
Windows-Tests with PHP 8.0	55s
Windows-Tests with PHP 8.1	1m 0s
Windows-Tests with PHP 8.2	51s
	11m 26s

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