pylint: Fix warning 'unnecessary "else" after "return"'

Recent pylint versions warn against the use of an 'else' in a
'try-except' block if using a 'return' on the 'except' part is is the
idom used by ansible-freeipa when retrieving IPA data objects.

This change removes the usage of the 'else:' in such cases, and modify
the templates so that new modules do not have the same issue in the
future.

plugins/modules/ipaautomountkey.py

@@ -121,8 +121,7 @@ class AutomountKey(IPAAnsibleModule):
             resp = self.ipa_command("automountkey_show", location, args)
         except ipalib_errors.NotFound:
             return None
-        else:
-            return resp.get("result")
+        return resp.get("result")
 
     def check_ipa_params(self):
         invalid = []