Do nothing if binary cache if not well configured.

slapos/grid/SlapObject.py

@@ -97,6 +97,9 @@ class Software(object):
           tar.close()
     else:
         self._install_from_buildout()
+        if (self.software_root and self.url and self.software_url_hash \
+                               and self.upload_binary_cache_url \
+                               and self.upload_binary_dir_url):
           tar = tarfile.open(tarpath, "w:gz")
           try:
             tar.add(self.software_path, arcname=self.software_url_hash)