Fix a missing documentation plugin.

Author: Frédéric Ferran

features/opensource/org.modelio.documentation.modeler/feature.xml

@@ -74,5 +74,11 @@ GPL
         version="0.0.0"
         fragment="false"
         unpack="false"/>
+<plugin id="org.modelio.documentation.modeliomodeler"
+        download-size="0"
+        install-size="0"
+        version="0.0.0"
+        fragment="false"
+        unpack="false"/>
 
 </feature>