Catch termios.error in pager

This error is raised by termios.tcgetattr on really old Linux versions
(here: Ubuntu 8.04.4) in doctests, that is, without a real stdout.

IPython/core/page.py

@@ -100,7 +100,10 b' def _detect_screen_size(screen_lines_def):'
     # flags each time), we just save the initial terminal state and
     # unconditionally reset it every time.  It's cheaper than making
     # the checks.
-    term_flags = termios.tcgetattr(sys.stdout)
+    try:
+        term_flags = termios.tcgetattr(sys.stdout)
+    except termios.error as err:
+        raise TypeError
 
     # Curses modifies the stdout buffer size by default, which messes
     # up Python's normal stdout buffering.  This would manifest itself