Add check to console.refresh in _pyrepl

Author: donbarbos

Lib/_pyrepl/unix_console.py

@@ -226,7 +226,7 @@ def change_encoding(self, encoding: str) -> None:
         """
         self.encoding = encoding
 
-    def refresh(self, screen, c_xy):
+    def refresh(self, screen: list[str], c_xy: tuple[int, int]) -> None:
         """
         Refresh the console screen.
 
@@ -238,8 +238,9 @@ def refresh(self, screen, c_xy):
         if not self.__gone_tall:
             while len(self.screen) < min(len(screen), self.height):
                 self.__hide_cursor()
-                self.__move(0, len(self.screen) - 1)
-                self.__write("\n")
+                if len(self.screen):
+                    self.__move(0, len(self.screen) - 1)
+                    self.__write("\n")
                 self.posxy = 0, len(self.screen)
                 self.screen.append("")
         else:

Lib/_pyrepl/windows_console.py

@@ -170,8 +170,9 @@ def refresh(self, screen: list[str], c_xy: tuple[int, int]) -> None:
 
         while len(self.screen) < min(len(screen), self.height):
             self._hide_cursor()
-            self._move_relative(0, len(self.screen) - 1)
-            self.__write("\n")
+            if len(self.screen):
+                self._move_relative(0, len(self.screen) - 1)
+                self.__write("\n")
             self.posxy = 0, len(self.screen)
             self.screen.append("")