change method call (#6)
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@ -61,7 +61,7 @@ class CellHelper
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*/
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public static function isNonEmptyString($value)
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{
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return (gettype($value) === 'string' && $value !== '' && !$this->isNumeric($value));
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return (gettype($value) === 'string' && $value !== '' && !self::isNumeric($value));
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}
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/**
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