minor fixes related to draft

src/PIL/ImageFile.py

@@ -119,11 +119,6 @@ class ImageFile(Image.Image):
         if not self.mode or self.size[0] <= 0:
             raise SyntaxError("not identified by this driver")
 
-    def draft(self, mode, size):
-        """Set draft mode"""
-
-        pass
-
     def get_format_mimetype(self):
         if self.custom_mimetype:
             return self.custom_mimetype

src/PIL/JpegImagePlugin.py

@@ -415,7 +415,7 @@ class JpegImageFile(ImageFile.ImageFile):
             return
 
         d, e, o, a = self.tile[0]
-        scale = 0
+        scale = 1
 
         if a[0] == "RGB" and mode in ["L", "YCbCr"]:
             self.mode = mode