Avoid Early Convert ret['comment'] to String

Fixes this exception:
An exception occurred in this state: Traceback (most recent call last):
  File "/var/tmp/.syops_b1274f_salt/py2/salt/state.py", line 1733, in call
    **cdata['kwargs'])
  File "/var/tmp/.syops_b1274f_salt/py2/salt/loader.py", line 1652, in wrapper
    return f(*args, **kwargs)
  File "/var/tmp/.syops_b1274f_salt/py2/salt/states/gpg.py", line 119, in present
    ret['comment'].append('Adding {0} to GPG keychain'.format(name))
AttributeError: 'str' object has no attribute 'append'

salt/states/gpg.py

@@ -132,7 +132,7 @@ def present(name,
                 else:
                     ret['comment'].append('Invalid trust level {0}'.format(trust))
 
-        ret['comment'] = '\n'.join(ret['comment'])
+    ret['comment'] = '\n'.join(ret['comment'])
     return ret
 
 
@@ -188,5 +188,5 @@ def absent(name,
                 ret['comment'].append('Deleting {0} from GPG keychain'.format(name))
         else:
             ret['comment'].append('{0} not found in GPG keychain'.format(name))
-        ret['comment'] = '\n'.join(ret['comment'])
+    ret['comment'] = '\n'.join(ret['comment'])
     return ret