[PR #10445/1f8b5eea backport][stable-10] cronvar: Handle empty value string properly (#10495)

cronvar: Handle empty value string properly (#10445)

* Fix empty  value issue  in cronvar

* Update changelog

* Update plugins/modules/cronvar.py



* Update changelogs/fragments/10445-cronvar-reject-empty-values.yml



* Update tests/integration/targets/cronvar/tasks/main.yml



* Update tests/integration/targets/cronvar/tasks/main.yml



* Accept empty strings on cronvar

* Update plugins/modules/cronvar.py



* Update main.yml



---------


(cherry picked from commit 1f8b5eea4c)

Co-authored-by: Giorgos Drosos <56369797+gdrosos@users.noreply.github.com>
Co-authored-by: Felix Fontein <felix@fontein.de>

plugins/modules/cronvar.py

@@ -396,6 +396,8 @@ def main():
     old_value = cronvar.find_variable(name)
 
     if ensure_present:
+        if value == "" and old_value != "":
+            value = '""'
         if old_value is None:
             cronvar.add_variable(name, value, insertbefore, insertafter)
             changed = True