terminal: fix "(<Skipped instance>)" skip reason in test status line

src/_pytest/outcomes.py

@@ -38,7 +38,7 @@ class OutcomeException(BaseException):
         self.pytrace = pytrace
 
     def __repr__(self) -> str:
-        if self.msg:
+        if self.msg is not None:
             return self.msg
         return f"<{self.__class__.__name__} instance>"
 

src/_pytest/terminal.py

@@ -1403,4 +1403,6 @@ def _get_raw_skip_reason(report: TestReport) -> str:
         _, _, reason = report.longrepr
         if reason.startswith("Skipped: "):
             reason = reason[len("Skipped: ") :]
+        elif reason == "Skipped":
+            reason = ""
         return reason