adds exception handling for AddConditionError (#5124)

AddConditionErrors are now handled by nxos_command and a well formed error
is returned from the module

network/nxos/nxos_command.py

@@ -155,7 +155,7 @@ from ansible.module_utils.network import NetworkModule, NetworkError
 from ansible.module_utils.netcli import CommandRunner
 from ansible.module_utils.netcli import FailedConditionsError
 from ansible.module_utils.netcli import FailedConditionalError
-from ansible.module_utils.netcli import AddCommandError
+from ansible.module_utils.netcli import AddCommandError, AddConditionError
 
 VALID_KEYS = ['command', 'output', 'prompt', 'response']
 
@@ -214,8 +214,12 @@ def main():
                 exc = get_exception()
                 warnings.append('duplicate command detected: %s' % cmd)
 
+    try:
         for item in conditionals:
             runner.add_conditional(item)
+    except AddConditionError:
+        exc = get_exception()
+        module.fail_json(msg=str(exc), condition=exc.condition)
 
     runner.retries = module.params['retries']
     runner.interval = module.params['interval']