Font.php: hot fix for calculateTextWidth in case Widths key is not set #561

Job	Run time
PHPUnit (PHP 7.1)	31s
PHPUnit coverage (PHP 7.4)	48s
PHPUnit (PHP 7.2)	26s
PHPUnit (PHP 7.3)	28s
PHPUnit (PHP 7.4)	37s
PHPUnit (PHP 8.0)	21s
PHPUnit (PHP 8.1)	20s
PHPUnit (PHP 8.2)	22s
PHPUnit (PHP 8.3)	36s
Tests alternative autoloader (PHP 7.1)	11s
PHPUnit Composer v2 (PHP 7.4)	39s
Tests alternative autoloader (PHP 7.2)	19s
Tests alternative autoloader (PHP 7.3)	8s
PHPUnit lowest deps (PHP 7.3)	32s
Tests alternative autoloader (PHP 7.4)	14s
Tests alternative autoloader (PHP 8.0)	8s
Tests alternative autoloader (PHP 8.1)	7s
Windows-Tests with PHP 7.1	55s
Tests alternative autoloader (PHP 8.2)	6s
Windows-Tests with PHP 7.2	58s
Tests alternative autoloader (PHP 8.3)	42s
Windows-Tests with PHP 7.3	51s
Windows-Tests with PHP 7.4	50s
Windows-Tests with PHP 8.0	49s
Windows-Tests with PHP 8.1	49s
Windows-Tests with PHP 8.2	47s
Windows-Tests with PHP 8.3	51s
	14m 25s

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