[enabler][zos_copy]Add_error_message (#1821)

* Add enhance error message

* Add fragment

* Update plugins/modules/zos_copy.py

Co-authored-by: Fernando Flores <[email protected]>

* Update 1821-Add_error_message.yml

* Update zos_copy.py

---------

Co-authored-by: Fernando Flores <[email protected]>

Author: AndreMarcel99

changelogs/fragments/1821-Add_error_message.yml

@@ -0,0 +1,3 @@
+minor_changes:
+  - zos_copy - Adds error message when a PDS/E source member does not exist or is not cataloged.
+    (https://github.com/ansible-collections/ibm_zos_core/pull/1821).

plugins/modules/zos_copy.py

@@ -3305,6 +3305,13 @@ def run_module(module, arg_def):
     raw_src = src
     raw_dest = dest
 
+    # Validation for copy from a member
+    if src_member:
+        if not (data_set.DataSet.data_set_member_exists(src)):
+            module.fail_json(msg="Unable to copy. Source member {0} does not exist or is not cataloged.".format(
+                data_set.extract_member_name(src)
+            ))
+
     # Implementing the new MVSDataSet class by masking the values of
     # src/raw_src and dest/raw_dest.
     if is_mvs_src: