v4.5.15.3 release

v4.5.15.3 had two bug fixes and one improvement.

Significant improvement

• Editors can now drag assets from The Shelf into single-value fields such as Lead and Section.

Significant defects addressed

• Corrected an issue throwing a ValidationException error when viewing a new image in The Shelf.
• Corrected an issue that prevented correct initialization of values in the content edit form, such as when changing a list from advanced to dynamic.