Fix fault by get cl_builder_path in scratch mode.

pym/cl_fill_builder.py

@@ -162,7 +162,7 @@ class fillVars(object, varsShare):
                     inidata = iniParser(inifile)
                     res = inidata.getVar("assemble","cl_assemble_path",
                                          checkExistVar=True)
-                    if res[0]:
+                    if res and res[0]:
                         return _toUNICODE(res[1]).encode('utf-8')
             return "/mnt/builder"
         return "/"