[SalesForce] How to restrict a column to display value if value exists

I have a pageblocktable that is inside pageblocksection. The pageblocktable has many columns. I want 1 of the columns to appear only if it exist.

Following is my code…

   <apex:pageblocksection title="Order infos" showheader="true" collapsible="true" columns="1">           
              <apex:pageBlockTable value="{!gp.con}" var="p">   
                <apex:column colspan="7"> 
                    <apex:facet name="header">#</apex:facet>
                    <apex:outputLink value="/{!p.id}"><apex:outputText value="{!p.Name}"/>
              </apex:outputLink>
                </apex:column>
                 <apex:column>
                     <apex:facet name="header">Material Name</apex:facet>
                     <apex:outputText value="{!p.gew_material_name__c}"/>
                 </apex:column....

I dont wan't the below nested table Shipment Info for the Order infos if there are no shipments info available.

                <apex:pageblocksection title="Shipment Info"  collapsible="true" columns="1">
                    <apex:pageBlockTable value="{!gp.opp}" var="q">
                          <apex:column > 
                                 <apex:facet name="header">Shipment Lines</apex:facet>
                                 <apex:outputLink value="/{!q.id}"><apex:outputText value="{!q.Name}"/>          
                           </apex:outputLink>
                          </apex:column> gew_quantity_shipped__c

For now a blank pagetable with all the column header shows like the below image. Ineed to show shipment info only if there are values, records.

Is this possible through rendered or javascript?