don't import any hubloc that doesn't have a sitekey. Eventually we should also verify that it is a valid key, as we've already seen one case where one character got mangled and messed up communication.

include/zot.php

@@ -583,9 +583,14 @@ function import_xchan($arr) {
 						intval(HUBLOC_FLAGS_PRIMARY),
 						intval($r[0]['hubloc_id'])
 					);
+					update_modtime($xchan_hash);
+					$changed = true;
 				}
-				update_modtime($xchan_hash);
-				$changed = true;
+				continue;
+			}
+
+			if(! $location['sitekey']) {
+				logger('import_xchan: empty hubloc sitekey. ' . print_r($location,true));
 				continue;
 			}
 

version.inc

@@ -1 +1 @@
-2013-08-09.400
+2013-08-11.402