update default color return and formatting

PyPDF2/generic.py

@@ -1703,10 +1703,16 @@ def additionalActions(self) -> Optional[DictionaryObject]: # pragma: no cover
  deprecate_with_replacement("additionalActions", "additional_actions")
  return self.additional_actions
 
+
 class OutlineItemFlag(IntFlag):
+ """
+ A class used as an enumerable flag for formatting outline font
+ """
+
  italic = 1
  bold = 2
 
+
 class Destination(TreeObject):
  """
  A class representing a destination within a PDF file.
@@ -1857,7 +1863,7 @@ def bottom(self) -> Optional[FloatObject]:
  @property
  def color(self) -> Optional[tuple]:
  """Read-only property accessing the color in (R, G, B) with values 0.0-1.0"""
- return self.get("/C", None)
+ return self.get("/C", (0.0, 0.0, 0.0))
 
  @property
  def fmt(self) -> Optional[OutlineItemFlag]: