commit daa66bc6acd2430cdd05e9883dd1eab69b698252
Author: Andy Grover <agrover@redhat.com>
Date:   Tue May 23 12:00:10 2017 -0700

    Handle if TERM is not set
    
    Previous patch causes problems otherwise in some cases.
    
    Signed-off-by: Andy Grover <agrover@redhat.com>

diff --git a/configshell/shell.py b/configshell/shell.py
index c916366..e029c76 100644
--- a/configshell/shell.py
+++ b/configshell/shell.py
@@ -50,13 +50,14 @@ else:
     tty=False
     
     # remember the original setting
-    oldTerm = os.environ['TERM']
+    oldTerm = os.environ.get('TERM')
     os.environ['TERM'] = ''
 
     import readline
 
     # restore the orignal TERM setting
-    os.environ['TERM'] = oldTerm
+    if oldTerm != None:
+        os.environ['TERM'] = oldTerm
     del oldTerm
     
 # Pyparsing helper to group the location of a token and its value