CatalogController: Create Picture with content & extension
CatalogController: Create Picture with content & extension

because of new validations added to Picture in ManageIQ/manageiq#13697, a Picture model always requires content and extension, and can't be created using argumentless Picture.new anymore.

Updating CatalogController to either create the model directly, or update the existing one.

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic