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cbc-apitool: print usage instead of crashing if no subcmd passed

The "required" param was added in python 3.7.

Change-Id: Ia8d13beeb8da64644d1aaf36deeddda4de889a6c
---
M contrib/cbc-apitool.py
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-cbc refs/changes/38/28738/1

diff --git a/contrib/cbc-apitool.py b/contrib/cbc-apitool.py
index 20d9819..299846a 100755
--- a/contrib/cbc-apitool.py
+++ b/contrib/cbc-apitool.py
@@ -117,7 +117,7 @@
     parser.add_argument("-p", "--port", help="TCP port to connect to", type=int, default=12345)
     parser.add_argument("-v", "--verbose", help="increase output verbosity", action='count', default=0)
 
-    subparsers = parser.add_subparsers()
+    subparsers = parser.add_subparsers(required=True)
 
     parser_c_cbs = subparsers.add_parser('create-cbs', help='Create a new CBS message')
     parser_c_cbs.add_argument("--msg-id", type=int, help='Message Identifier', required=True)

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