Redo: Redo except for CPListItem.

Sources/Extensions/ImageView+Kingfisher.swift

@@ -354,8 +354,6 @@ extension KingfisherWrapper where Base: KFCrossPlatformImageView {
                         if let image = options.onFailureImage {
                             mutatingSelf.placeholder = nil
                             self.base.image = image
-                        } else {
-                          mutatingSelf.placeholder = placeholder
                         }
                         completionHandler?(result)
                     }

Sources/Extensions/NSButton+Kingfisher.swift

@@ -157,8 +157,6 @@ extension KingfisherWrapper where Base: NSButton {
                     case .failure:
                         if let image = options.onFailureImage {
                             self.base.image = image
-                        } else {
-                          self.base.image = placeholder
                         }
                         completionHandler?(result)
                     }

Sources/Extensions/NSTextAttachment+Kingfisher.swift

@@ -225,8 +225,6 @@ extension KingfisherWrapper where Base: NSTextAttachment {
                     case .failure:
                         if let image = options.onFailureImage {
                             self.base.image = image
-                        } else {
-                          self.base.image = placeholder
                         }
                     }
                     completionHandler?(result)

Sources/Extensions/TVMonogramView+Kingfisher.swift

@@ -129,8 +129,6 @@ extension KingfisherWrapper where Base: TVMonogramView {
                     case .failure:
                         if let image = options.onFailureImage {
                             self.base.image = image
-                        } else {
-                          self.base.image = placeholder
                         }
                         completionHandler?(result)
                     }

Sources/Extensions/UIButton+Kingfisher.swift

@@ -165,8 +165,6 @@ extension KingfisherWrapper where Base: UIButton {
                     case .failure:
                         if let image = options.onFailureImage {
                             self.base.setImage(image, for: state)
-                        } else {
-                          self.base.setImage(placeholder, for: state)
                         }
                         completionHandler?(result)
                     }

Sources/Extensions/WKInterfaceImage+Kingfisher.swift

@@ -159,8 +159,6 @@ extension KingfisherWrapper where Base: WKInterfaceImage {
                     case .failure:
                         if let image = options.onFailureImage {
                             self.base.setImage(image)
-                        } else {
-                          self.base.setImage(placeholder)
                         }
                         completionHandler?(result)
                     }