How do I show no icon when column's state is false?

class Note extends Model
{
    protected $casts = [
        'is_important' => 'boolean',
    ];
}

class Note extends Model
{
    protected $casts = [
        'is_important' => 'boolean',
    ];
}

Tables\Columns\IconColumn::make('is_important')
    ->icon(fn (string $state): string => match ($state) {
            '1' => 'heroicon-o-exclamation-circle',
            '' => '',
        })

Tables\Columns\IconColumn::make('is_important')
    ->icon(fn (string $state): string => match ($state) {
            '1' => 'heroicon-o-exclamation-circle',
            '' => '',
        })