【BOTA】Note背景渲染无法识别Color crash修复

PDF Office/PDF Master/Class/PDFWindowController/Side/LeftSide/Annotation/KMAnnotationView/Views/KMAnnotationOutlineCellView.swift

@@ -225,7 +225,7 @@ class KMAnnotationOutlineCellView: NSTableCellView {
             noteType = SKNSignatureString
         }
         let imageView = KMNoteTypeImageView()
-        let image = imageView.noteTypeImage(withType: noteType, color: noteColor ?? NSColor())
+        let image = imageView.noteTypeImage(withType: noteType, color: noteColor ?? NSColor.clear)
         self.iconImageView.image = image
     }
 }