Set a default fallback image as Group header logo image on save (ref: CLIENT_G3WSUITE_LOGO)

[wlorenzetti]

Closes: #498

[Raruto]

@volterra79 by chance, do you encounter any particular issues with this edit?

I'm not really sure if it's related, but after I switched to this branch I got all the admin CSS and JS files messed up (ie. 4xx error)

[volterra79]

@volterra79 by chance, do you encounter any particular issues with this edit?

I'm not really sure if it's related, but after I switched to this branch I got all the admin CSS and JS files messed up (ie. 4xx error)

@Raruto i need to try. I let you know

[Raruto]

Test perfomed: "deleting a previously uploaded image"

The image field is still mandatory if you try to delete a previously uploaded image. The problem here lies in the fact that the form interface does not show the field as mandatory (e.g. with an asterisk) before saving (or it's just an oversight and the field must always be optional).

[wlorenzetti]

@Raruto ok we left field mandatory, but we set by default a logo image.

[Raruto]

@wlorenzetti Good enough, I would also consider this other change:

BEFORE: background-repeat: repeat;

AFTER: background-repeat: no-repeat;