Removed 'default=None' in a batch of modules 2 (#4567)

* removed default=None

* added changelog fragment

plugins/modules/cloud/smartos/smartos_image_info.py

@@ -95,7 +95,7 @@ class ImageFacts(object):
 def main():
     module = AnsibleModule(
         argument_spec=dict(
-            filters=dict(default=None),
+            filters=dict(),
         ),
         supports_check_mode=True,
     )

plugins/modules/cloud/smartos/vmadm.py

@@ -684,7 +684,7 @@ def main():
             choices=['present', 'running', 'absent', 'deleted', 'stopped', 'created', 'restarted', 'rebooted']
         ),
         name=dict(
-            default=None, type='str',
+            type='str',
             aliases=['alias']
         ),
         brand=dict(
@@ -709,7 +709,7 @@ def main():
     # Add our 'simple' options to options dict.
     for type in properties:
         for p in properties[type]:
-            option = dict(default=None, type=type)
+            option = dict(type=type)
             options[p] = option
 
     module = AnsibleModule(