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fixed null conversation for strToUpper (#2292) 

fixed in the same way as it already has been done for strToLower

Co-authored-by: Adrien Crivelli <adrien.crivelli@gmail.com>
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Roland Eigelsreiter 2021-11-01 03:45:21 +01:00 committed by GitHub
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commit 4c4ae2634f
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2
src/PhpSpreadsheet/Shared/StringHelper.php
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@ -490,7 +490,7 @@ class StringHelper
*/ */
public static function strToUpper($textValue) public static function strToUpper($textValue)
{ {
return mb_convert_case($textValue, MB_CASE_UPPER, 'UTF-8'); return mb_convert_case($textValue ?? '', MB_CASE_UPPER, 'UTF-8');
} }
/** /**