Fix exception case where LoadExtensions fails and break subsequent rendering.

Thanks CJ Bourn for the bug report and fix.

Change-Id: Ie60014a7f630efc1d22140ac2562b3d28b7e4936
Merge topic '0012703_clear_InRender_flag_on_LoadExtension_failure' into master

e28ce837 Fix exception case where LoadExtensions fails and break subsequent rendering.