Check that onion address was created

src/freedombone

     else
         sed -i "s|Mediagoblin onion domain.*|Mediagoblin onion domain:${MEDIAGOBLIN_ONION_HOSTNAME}|g" $COMPLETION_FILE
     fi
-
+    if [[ $MEDIAGOBLIN_ONION_HOSTNAME == *"not found"* ]]; then
+        echo $'Problem creating onion address for mediagoblin'
+        exit 672652
+    fi
+    
     # web config
     MEDIAGOBLIN_VIRTUAL_HOST=/etc/nginx/sites-available/$MEDIAGOBLIN_DOMAIN_NAME
     nginx_http_redirect $MEDIAGOBLIN_DOMAIN_NAME