Make ntpq die gracefully is the ntp library can't be found

ntpq/ntpq

@@ -14,10 +14,14 @@ from __future__ import print_function, division
 import os, sys, getopt, cmd, re
 import socket, hashlib
 
-from ntp.packet import *
-from ntp.util import *
-from ntp.ntpc import *
-import ntp.version
+try:
+    from ntp.packet import *
+    from ntp.util import *
+    from ntp.ntpc import *
+    import ntp.version
+except ImportError:
+    sys.stderr.write("ntpq: can't find the Python NTP library -- bailing out.\n")
+    sys.exit(1)
 
 # This import only works on Unixes.  The intention is to enable
 # Ctrl-P, Ctrl-N, and friends in Cmd.