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Namespace attributes cannot be empty, so it's not directly possible to make something like that optional I believe.

Something like this might work:

• first launch file:

  <launch>
    <arg name="use_namespace" default="false" />
    <include file="other.launch"     if="$(arg use_namespace)" ns="my_ns" />
    <include file="other.launch" unless="$(arg use_namespace)" />
  </launch>
  

• second launch file (just an example):

  <launch>
    <param name="la" value="123" />
  </launch>