Do not pass null value to strtolower()#127
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Passing a null value to strtolower() is deprecated in PHP 8.1. However, without output shell_exec() returns null instead of an empty string, which causes a deprecation warning. I wrote the if clause open instead of using the ternary operator to improve the code readability.
* All fonts are licensed with OFL and the license texts are now attached to the fonts (Gregwar#102) * Replaced font 2 with a one with both upper and lower case fonts (Gregwar#83) * Font 5 (Sling) did not contain fonts to some 8 bit characters (ÅÄÖ)
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Passing a null value to strtolower() is deprecated in PHP 8.1. However, without output shell_exec() returns null instead of an empty string, which causes a deprecation warning.
I wrote the if clause open instead of using the ternary operator to improve the code readability.
This fixes issue #124