These warnings are usually generated when there is a parsys included and the parsys is empty without any components added to it. For example in the below code parsys "warning_test", a node warning_test is not created until there is a component added to parsys "warning_test" and hence the warning message. Adding a component to the parsys should create a node and avoid the warning.
These warnings are not related to MSM live copies and does not appear to have a detrimental effect.
<div class="grid_12 body_container">
<cq:include script="redirect.jsp"/>
<cq:include path="par" resourceType="foundation/components/parsys"/>
</div>
<div class="grid_4 right_container">
<cq:include path="rightpar" resourceType="foundation/components/iparsys"/>
</div>
Adobe Test Warning Message
<cq:include path="warning_test" resourceType="foundation/components/parsys"/>
<div class="clear"></div>
</div>