`[bw_images]` shortcode not setting `alt=` attribute on the `<img>` tag.

[bobbingwide]

I upgraded oik to v4.16.0-RC1 on a website and discovered that the logo image was no longer being displayed in the sidebar.
It was coded in a text widget as

[bw_images id=24 link=n titles=y]

• I reverted oik to v4.15.4 and it still didn't work.
• I reverted oik to v4.15.3 and it worked again.

I then changed the link=n parameter to link=0 and it worked.
I must have forgotten that link=0 is equivalent to link=n.

Note: It would appear that it's also possible to diplay more than one image and link each image to a different post.

[bobbingwide]

I'm going to repurpose this issue since the bw_images shortcode is not setting the alt= attribute on the <img> tag
and I'll probably have to do something when there image is within a link.