Re-raise InvalidPrivsError when granting privileges

plugins/module_utils/user.py

@@ -644,7 +644,10 @@ def privileges_grant(cursor, user, host, db_table, priv, tls_requires, maria_rol
     if 'GRANT' in priv:
         query.append("WITH GRANT OPTION")
     query = ' '.join(query)
+    try:
         cursor.execute(query, params)
+    except (mysql_driver.ProgrammingError, mysql_driver.OperationalError, mysql_driver.InternalError) as e:
+        raise InvalidPrivsError("Error granting privileges, invalid priv string: %s" % priv_string) from e
 
 
 def convert_priv_dict_to_str(priv):

tests/integration/targets/test_mysql_user/tasks/test_priv_append.yml

@@ -112,7 +112,7 @@
       assert:
         that:
           - "result.changed == false"
-          - "'Illegal privilege' in result.msg or 'You have an error in your SQL syntax;' in result.msg"
+          - "'Error granting privileges' in result.msg"
       when: enable_check_mode == 'no'
 
     ##########

tests/integration/targets/test_mysql_user/tasks/test_privs.yml

@@ -193,7 +193,7 @@
       assert:
         that:
           - "result.changed == false"
-          - "'Illegal privilege' in result.msg or 'You have an error in your SQL syntax;' in result.msg"
+          - "'Error granting privileges' in result.msg"
 
     - name: remove username
       mysql_user: