This situation,I have ever come across.
The solution is below:
First,
You should use rendered in
<rich:dataTable var="m" value="#{beanname.property}">
<rich:column>
<h:outputText id="" value="#{m.property}" rendered="#{m.property =='' ?ture:false}">
</rich:column>
my Msn:is
renfeiyang123@live.cn. you can communicate with me.