Fix AttributeErrors in nic methods

pyvcloud/vcd/vm.py

@@ -716,13 +716,14 @@ def delete_nic(self, index):
         indices = [None] * 10
         nic_not_found = True
         # find the nic with the given index
-        for nc in net_conn_section.NetworkConnection:
-            if int(nc.NetworkConnectionIndex.text) == index:
-                net_conn_section.remove(nc)
-                nic_not_found = False
-            else:
-                indices[int(nc.NetworkConnectionIndex.
-                            text)] = nc.NetworkConnectionIndex.text
+        if hasattr(net_conn_section, 'NetworkConnection'):
+            for nc in net_conn_section.NetworkConnection:
+                if int(nc.NetworkConnectionIndex.text) == index:
+                    net_conn_section.remove(nc)
+                    nic_not_found = False
+                else:
+                    indices[int(nc.NetworkConnectionIndex.
+                                text)] = nc.NetworkConnectionIndex.text
 
         if nic_not_found:
             raise InvalidParameterException(
@@ -1380,27 +1381,29 @@ def update_nic(self, network_name, nic_id=0,
         # get network connection section.
         net_conn_section = self.get_resource().NetworkConnectionSection
         nic_index = 0
-        nic_found = False
-        for network in net_conn_section.NetworkConnection:
-            if network.get('network') == network_name:
-                if network.NetworkConnectionIndex == nic_id:
-                    nic_found = True
-                    if ip_address is not None:
-                        network.IpAddress = E.IpAddress(ip_address)
-                    network.IsConnected = E.IsConnected(is_connected)
-                    if ip_address_mode is not None:
-                        network.IpAddressAllocationMode = \
-                            E.IpAddressAllocationMode(ip_address_mode)
-                    if adapter_type is not None:
-                        network.NetworkAdapterType = E.NetworkAdapterType(
-                            adapter_type)
-                    if is_primary:
-                        nic_index = network.NetworkConnectionIndex
-                    break
-
-        if nic_found is False:
+        nic_not_found = True
+        if hasattr(net_conn_section, 'NetworkConnection'):
+            for nc in net_conn_section.NetworkConnection:
+                if nc.get('network') == network_name:
+                    if int(nc.NetworkConnectionIndex.text) == nic_id:
+                        nic_not_found = False
+                        if ip_address is not None:
+                            nc.IpAddress = E.IpAddress(ip_address)
+                        nc.IsConnected = E.IsConnected(is_connected)
+                        if ip_address_mode is not None:
+                            nc.IpAddressAllocationMode = \
+                                E.IpAddressAllocationMode(ip_address_mode)
+                        if adapter_type is not None:
+                            nc.NetworkAdapterType = E.NetworkAdapterType(
+                                adapter_type)
+                        if is_primary:
+                            nic_index = nc.NetworkConnectionIndex
+                        break
+
+        if nic_not_found:
             raise EntityNotFoundException(
-                'Vapp with name \'%s\' not found.' % network_name)
+                'Nic with name \'%s\' and index \'%s\' is not found in the VM \'%s\'' %
+                (network_name, nic_id, self.get_resource().get('name')))
 
         if is_primary:
             nic_index = int(nic_index.text)