Fix error message when adding dnsforwardzone without forwarders.

plugins/modules/ipadnsforwardzone.py

@@ -217,6 +217,11 @@ def main():
             # Make sure forwardzone exists
             existing_resource = find_dnsforwardzone(ansible_module, name)
 
+            # validate parameters
+            if state == 'present':
+                if existing_resource is None and not forwarders:
+                    ansible_module.fail_json(msg='No forwarders specified.')
+
             if existing_resource is None and operation == "update":
                 # does not exist and is updating
                 # trying to update something that doesn't exist, so error

tests/dnsforwardzone/test_dnsforwardzone.yml

@@ -5,10 +5,12 @@
   gather_facts: false
 
   tasks:
-  - name: ensure forwardzone example.com is absent - prep
+  - name: ensure test forwardzones are absent - prep
     ipadnsforwardzone:
       ipaadmin_password: SomeADMINpassword
-      name: example.com
+      name:
+      - example.com
+      - newfailzone.com
       state: absent
 
   - name: ensure forwardzone example.com is created
@@ -207,6 +209,13 @@
     register: result
     failed_when: result.changed
 
+  - name: Ensure forwardzone is not added without forwarders, with correct message.
+    ipadnsforwardzone:
+      ipaadmin_password: SomeADMINpassword
+      name: newfailzone.com
+    register: result
+    failed_when: not result.failed or "No forwarders specified" not in result.msg
+
   - name: ensure forwardzone example.com is absent - tidy up
     ipadnsforwardzone:
       ipaadmin_password: SomeADMINpassword