295 avoid errors

[ivmartel]

Fixes #295

[ikhizarwork]

after updating this 2 file changes as mentioned by you , i found one issue , when we are trying to do a drag and drop , then it is overlapping the image slices with one another , you can refer to the attach ss for the same .

please provide a solution for the same ,

and if we are using the old code especially in infoController.js then the drag and drop event is working fine but getting the following error :-

error: TypeError: Cannot read properties of undefined (reading '00020010')
    at dwvjq.gui.info.Controlle…, source: File, loadtype: 'image', dataid: '1', type: 'error'}

[ikhizarwork]

@ivmartel please provide a fix to this issue .

[ivmartel]

See #307 for answer.