Failing to read empty sheets in PHP 5.4.12

0.6.2 failed to read empty worksheets and the following patch fixed it for me.

107c107
< $index = $this->_columnIndex( end($d) );
---
> $index = $this->_columnIndex( $d[1] );


Please consider hosting this project in github.
Thanks.

I tried trigger this error, but don't have yours results.

I did empty.xlsx

$xlsx = new SimpleXLSX('empty.xlsx');

print_r( $xlsx->dimension(1) );

---
Array
(
[0] => 0
[1] => 0
)

My file is a premade one with one large sheet and two empty ones. I'm sorry but I'm not allowed to share it.
In my case it seems that only the width dimension is being set to empty sheets, thus $ws->dimension['ref'] is only 'A1'.

And the error I'm getting is Undefined offset: 1 for $d[1] in line 107. This might have been just a warning in previous PHP versions.