Potential inline styling issue

I just found a potential issue, and would like to report.

We included Gaussholder on our project, and two things happened:

First issue, original image had physical dimensions as `width=599px` and `height=307px` but this parameters weren't explicitly set for image on admin. Found that Gaussholder automatically included the inline styling `style="width: 1px; height: 1px;"` for this image, making the image to disappear on the frontend. This problem was fixed when I explicitly set `width` and `height` parameters for this image on admin. A suggestion for this case would be using image dimensions on this inline styling.

Second issue, original image was very big (4833 x 2355 pixels) and it was being used as an icon. The parameter `width` was being set to 50px on admin, but `height` parameter was missing. Found that Gaussholder ended up setting the image as 50x2355px, what made the image to be displayed incorrectly. A suggestion for this case, when we have only one of the parameters `width` or `height` explicitly set, is to get which one that is set and find out the image ratio, applying an appropriate value for the other parameter instead of the original image dimension.

I would try to find some time to open a PR for these issues.