PHP8.1 comptability deprecated null string
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@ -509,7 +509,7 @@ class Card_Property
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// account
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if ($value->ad_id==ATTR_DEF_ACCOUNT)
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{
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$v=mb_strtoupper($value->av_text);
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$v=mb_strtoupper($value->av_text??"");
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// 2 accounts given
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if (trim($v)!='')
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{
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