[Bug]: Table first rows render in top-left cell if first cell in header is empty.

[boxsnake]

Is the bug applicable and reproducable to the latest version of the package and hasn't it been reported before?

• Yes, it's still reproducable

What version of Laravel Excel are you using?

3.1.62

What version of Laravel are you using?

11.36.1

What version of PHP are you using?

8.3.17

Describe your issue

When exporting excel, if WithHeadings and WithMapping are used, if headings() returned with first cell empty (null or ''), the first row will be written to top-left cell of heading (and overwrite heading cells).

How can the issue be reproduced?

<?php

class Demo implements
    WithHeadings,
    FromCollection,
    WithMapping
{
    protected Collection $rows;

    public function __construct(
        Collection $rows
    ) {
        $this->rows= $rows;
    }

    public function headings(): array
    {
        return [
            '',
            'Header'
        ];
    }

    public function collection()
    {
        return $this->rows;
    }

    public function map($row): array
    {
        return [
            $row->field
        ];
    }
}

This will product with $row->field rendered in cell A1.

What should be the expected behaviour?

The $row->field rendered to cell A2 with on row of header.

[patrickbrouwers]

Try to put a space (or something non-empty) in the first cell, unfortunatly there's no other good way to determine if the first row has already been used.