create ipython_dir if not exists

IPython/paths.py

@@ -71,6 +71,8 b' def get_ipython_dir() -> str:'
             warn("IPython parent '{0}' is not a writable location,"
                     " using a temp directory.".format(parent))
             ipdir = tempfile.mkdtemp()
+        else:
+            os.makedirs(ipdir)
     assert isinstance(ipdir, str), "all path manipulation should be str(unicode), but are not."
     return ipdir