Workaround for empty global settings idempotency (#25)

Author: dpassante

changelogs/fragments/25-empty_config_idempotency.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - cs_configuration - Workaround for empty global settings idempotency (https://github.com/ngine-io/ansible-collection-cloudstack/pull/25).

plugins/modules/cs_configuration.py

@@ -224,7 +224,8 @@ def present_configuration(self):
         configuration = self.get_configuration()
         args = self._get_common_configuration_args()
         args['value'] = self.get_value()
-        if self.has_changed(args, configuration, ['value']):
+        empty_value = args['value'] in [None, ''] and 'value' not in configuration
+        if self.has_changed(args, configuration, ['value']) and not empty_value:
             self.result['changed'] = True
             if not self.module.check_mode:
                 res = self.query_api('updateConfiguration', **args)