Fix GetChassisPower when multiple chassis are present (#4902) (#4914)

* Fix GetChassisPower when multiple chassis are present

When multiple chassis are present, and one or more of those chassis do _not_
report power information, the GetChassisPower command will fail. To address
that, only report a failure if _all_ of the Chassis objects lack power
power reporting functionality.

Fixes #4901

* Update changelogs/fragments/4901-fix-redfish-chassispower.yml

Co-authored-by: Felix Fontein <felix@fontein.de>

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit f60d12cf2d)

Co-authored-by: Jacob Yundt <jyundt@gmail.com>

changelogs/fragments/4901-fix-redfish-chassispower.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - redfish_info - fix to ``GetChassisPower`` to correctly report power information when multiple chassis exist, but not all chassis report power information (https://github.com/ansible-collections/community.general/issues/4901).

plugins/module_utils/redfish_utils.py

@@ -1883,14 +1883,13 @@ class RedfishUtils(object):
                         for property in properties:
                             if property in data:
                                 chassis_power_result[property] = data[property]
-                else:
-                    return {'ret': False, 'msg': 'Key PowerControl not found.'}
                 chassis_power_results.append(chassis_power_result)
-            else:
-                return {'ret': False, 'msg': 'Key Power not found.'}
 
-        result['entries'] = chassis_power_results
-        return result
+        if len(chassis_power_results) > 0:
+            result['entries'] = chassis_power_results
+            return result
+        else:
+            return {'ret': False, 'msg': 'Power information not found.'}
 
     def get_chassis_thermals(self):
         result = {}