Fix #22130 (ini_file crash when destination file don't exists or is e… (#22132)

* Fix #22130 (ini_file crash when destination file don't exists or is empty)

lib/ansible/modules/files/ini_file.py

@@ -176,6 +176,10 @@ def do_ini(module, filename, section=None, option=None, value=None,
 
     changed = False
 
+    # ini file could be empty
+    if not ini_lines:
+        ini_lines.append('\n')
+
     # last line of file may not contain a trailing newline
     if ini_lines[-1] == "" or ini_lines[-1][-1] != '\n':
         ini_lines[-1] += '\n'