do not define an empty addon paths

start

@@ -110,8 +110,11 @@
 	then
 	    addons_path="--addons-path=$($python -B -c "import ConfigParser ; c = ConfigParser.ConfigParser() ; c.read('${project_home}/setup.cfg') ; print(','.join(['$HOME/src/openobject-server/openerp/addons','$HOME/src/openobject-addons','$HOME/src/openerp-web/addons']+['${project_home}/'+line for line in c.get('odoo_scripts', 'addon_dirs', '').split()]))")"
 	else
-            # it is not necessary to give odoo its own addons in path
-	    addons_path="--addons-path=$($python -B -c "import ConfigParser ; c = ConfigParser.ConfigParser() ; c.read('${project_home}/setup.cfg') ; print(','.join(['${project_home}/'+line for line in c.get('odoo_scripts', 'addon_dirs', '').split()]))")"
+	    pathes=$($python -B -c "import ConfigParser ; c = ConfigParser.ConfigParser() ; c.read('${project_home}/setup.cfg') ; print(','.join(['${project_home}/'+line for line in c.get('odoo_scripts', 'addon_dirs', '').split()]))")
+	    if [ -n "$pathes" ];
+	    then
+		addons_path="--addons-path=$pathes"
+	    fi
 	fi
     fi
 fi