fix mouse drag on touchscreens

nchl.py

@@ -160,9 +160,14 @@ class NCHL:
 
             # mouse
             if k == "KEY_MOUSE":
-                _, mx, my, _, _ = curses.getmouse()
-                self.logger.info(f"mouse: {mx} {my}")
-                self.fs_main.send_mouse(mx, my)
+                try:
+                    _, mx, my, _, _ = curses.getmouse()
+                except curses.error:
+                    pass
+                else:
+                    self.logger.info(f"mouse: {mx} {my}")
+                    self.fs_main.send_mouse(mx, my)
+                continue
 
             # send key to main window
             self.fs_main.send_key(k)