cubicweb-forge #2894841 incomplete migration for project icon [validation pending]

meta-attributes for project icons are not added.

prioritynormal
typebug
done in1.9.1
load0.250
load left0.000
closed by#fa0ab63c1efe [migration] fix missing icon_format in 1.9.0 migration script (closes #2894841)
patch[migration] fix missing icon_format in 1.9.0 migration script (closes #2894841) [applied]