Fix anchor.js

[wwojtkowski]

It doesn't work when you have the address with nativeCol = 0

[Siemienik]

Col and row are always >= 1

But rigth, that's good pull request

[Siemienik]

@wwojtkowski could i please you for write a test that's failed this code before changes?

[wwojtkowski]

Col and row are always >= 1

But rigth, that's good pull request

I cannot agree with you. Rows are always >= 1 but not col.
I have Excel's file where I have images in the first column in every row.
In the Anchor class nativeCol has 0 value but nativeRow has proper value (>=1).
Before my fix, all images from worksheet have nativeRow = 0 and nativeCol = 0 - which is a very serious bug.

[Siemienik]

@wwojtkowski ok, thanks for the explanation :)

I want to merge it, but it's required to cover changes by tests

[vidyakin]

@Siemienik , I have error with the word 'anchor' when call openFile, may it be the same problem? :)

TypeError: Cannot read property 'anchors' of undefined
    at DrawingXform.reconcile (C:\web\my_prj\node_modules\exceljs\lib\xlsx\xform\drawing\drawing-xform.js:94:11)
    at Object.keys.forEach.name (C:\web\my_prj\node_modules\exceljs\lib\xlsx\xlsx.js:103:22)
    at Array.forEach (<anonymous>)
    at XLSX.reconcile (C:\web\my_prj\node_modules\exceljs\lib\xlsx\xlsx.js:95:33)
    at PromiseLib.Promise.all.then (C:\web\my_prj\node_modules\exceljs\lib\xlsx\xlsx.js:389:16)

But it appears in the ONLY Excel file that is important for my task!
And there are some interesting things I found:

• If I copy all worksheet and paste to new workbook, it works.
• If I run in Excel "check compatibility" function and do correct operation - it works!