don't insert junk into clientcode table

diff --git a/scripts/lib/build_client.js b/scripts/lib/build_client.js
index 7953a61..2e0826f 100755 (executable)
--- a/scripts/lib/build_client.js
+++ b/scripts/lib/build_client.js
@@ -21,6 +21,9 @@ var _ = require('underscore'),
   exports.getClientSql = function (extPath, callback) {
     var extName,
       constructQuery = function (contents, extension, version, language) {
+        if (!contents || contents === "undefined") {
+          return "";
+        }
         return "select xt.js_init();select xt.insert_client($$" + contents +
           "$$, '" + extension +
           "', '" + version +