Fix bug 957: Return pubkey properly

Change-Id: I1265e972ee0a085733c5597dc2c793021713ee62
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/n2vc/n2vc_juju_conn.py b/n2vc/n2vc_juju_conn.py
index 65dac3e..7c55af7 100644
--- a/n2vc/n2vc_juju_conn.py
+++ b/n2vc/n2vc_juju_conn.py
@@ -439,7 +439,7 @@
             raise e
 
         # return public key if exists
-        return output
+        return output["pubkey"] if "pubkey" in output else output
 
     async def add_relation(
         self,