Bug 2116 fixed: obtaining the queuePosition key using the get method

Change-Id: I53c63960be41a897d093f948d4cc5e377c80389f
Signed-off-by: Pedro Escaleira <escaleira@av.it.pt>
diff --git a/osmclient/scripts/osm.py b/osmclient/scripts/osm.py
index 397d932..f68fb0c 100755
--- a/osmclient/scripts/osm.py
+++ b/osmclient/scripts/osm.py
@@ -1014,7 +1014,7 @@
             action_name = op["operationParams"]["primitive"]
         detail = "-"
         if op["operationState"] == "PROCESSING":
-            if op["queuePosition"] is not None and op["queuePosition"] > 0:
+            if op.get("queuePosition") is not None and op.get("queuePosition") > 0:
                 detail = "In queue. Current position: {}".format(op["queuePosition"])
             elif op["lcmOperationType"] in ("instantiate", "terminate"):
                 if op["stage"]: