skip rsync if there are no files to sync but also only if delete is F…

…alse

closes #2221
https://pulp.plan.io/issues/2221

Signed-off-by: Ina Panova <ipanova@redhat.com>

server/pulp/plugins/rsync/publish.py

@@ -226,8 +226,11 @@ def rsync(self):
                   generated by rsync command)
         :rtype: tuple
         """
-        if not self.file_list:
+        if not self.file_list and not self.delete:
             return (True, _("Nothing to sync"))
+        if not os.path.exists(self.src_directory):
+            os.makedirs(self.src_directory)
+
         output = ""
         list_of_files = os.path.join(self.get_working_dir(), str(uuid.uuid4()))
         open(list_of_files, 'w').write("\n".join(sorted(self.file_list)))