Add N2VCNotFound exception

Change-Id: I83702862086996adaefbfb9721f08f40bc943a44
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/n2vc/exceptions.py b/n2vc/exceptions.py
index a663c62..815d4ea 100644
--- a/n2vc/exceptions.py
+++ b/n2vc/exceptions.py
@@ -125,6 +125,18 @@
         return '<{}> Invalid certificate: {}'.format(type(self), super().__str__())
 
 
+class N2VCNotFound(N2VCException):
+    """
+    Not found
+    """
+
+    def __init__(self, message: str = ''):
+        N2VCException.__init__(self, message=message)
+
+    def __str__(self):
+        return '<{}> Not found: {}'.format(type(self), super().__str__())
+
+
 class K8sException(Exception):
     """
     K8s exception
diff --git a/n2vc/n2vc_juju_conn.py b/n2vc/n2vc_juju_conn.py
index 4456dd9..6b8ac09 100644
--- a/n2vc/n2vc_juju_conn.py
+++ b/n2vc/n2vc_juju_conn.py
@@ -32,7 +32,7 @@
 from n2vc.n2vc_conn import obj_to_dict, obj_to_yaml
 from n2vc.exceptions \
     import N2VCBadArgumentsException, N2VCException, N2VCConnectionException, \
-    N2VCExecutionException, N2VCInvalidCertificate
+    N2VCExecutionException, N2VCInvalidCertificate, N2VCNotFound
 from n2vc.juju_observer import JujuModelObserver
 
 from juju.controller import Controller
@@ -1294,7 +1294,7 @@
         model = await self._juju_get_model(model_name=model_name)
 
         if not model:
-            raise N2VCException(
+            raise N2VCNotFound(
                 message="Model {} does not exist".format(model_name)
             )