Accessibility for alt and title attributes

Screen readers should ignore the image attached to "documents/image links.
I would like to "Nullify" the "title" attribute.

<img class="file-icon" alt="" title="application/pdf" src="/modules/file/icons/application-pdf.png">
Sorry if this is just dense or misfiled!

Here's the Accessibility issue:

Using null alt text and no title attribute on img elements for images that AT (assistive Technologies) should ignore

The purpose of this technique is to show how images can be marked so that they can be ignored by Assistive Technology.
If no title attribute is used, and the alt text is set to null (i.e. alt="") it indicates to assistive technology that the image can be safely ignored.
Note: Have a "null" alt attribute is not the same as having no alt attribute.

Procedure

For each image that should be ignored:

- Check that title attribute is either absent or empty.
- Check that alt attribute is present and empty.