XlsxReader doesn't respect calculated tableArea for header column names

[lujop]

There is a buggy condition on some excels when there are blank columns at the start of the sheet.

When es.decide.toolbox.util.XlsxReader#createTable calculates header names it uses a for(Cell cell : row) instead of using the supplied tableArea parameters.

And when there are some blank columns it doesn't always work. I don't know exactly why, but sometimes the first blank column is discarded in the iterator, but sometimes although all values are blank poi maintains the column, and the code doesn't work correctly detecting the header column names.

To calculate the header column names the code should use the tableArea.startColumn and tableArea.endColumn

[lujop]

I will be happy to provide a PR for this if it's recognized as an issue.

[lwhite1]

If you want to submit a PR with good test coverage, that would be great.

[DanielMao1]

@lujop Hello, bro, do you still work on this issue? I have encountered the same problem and got some ideas to fix this bug. If you are busy, I can work on this issue.

[lujop]

Thanks, @DanielMao1, just yesterday I got some time to do some work on a proposition for some reader-related issues that I've not yet finished but I will try to make a PR this weekend.
If you're in a hurry just do, and if not, and can wait this weekend I will try to submit.

[DanielMao1]

Thanks, @DanielMao1, just yesterday I got some time to do some work on a proposition for some reader-related issues that I've not yet finished but I will try to make a PR this weekend.
If you're in a hurry just do, and if not, and can wait this weekend I will try to submit.

OK, here you go. I am not in so hurry to do PR. You can go ahead on this issue anyway :).