Fixes #266 bad value for extendsModel doesn't generate error.
Fixes #266 bad value for extendsModel doesn't generate error.

osric-the-knight/foam,foam-framework/foam,jlhughes/foam,mdittmer/foam,jacksonic/foam,foam-framework/foam,jacksonic/foam,osric-the-knight/foam,mdittmer/foam,osric-the-knight/foam,jacksonic/foam,jlhughes/foam,foam-framework/foam,foam-framework/foam,mdittmer/foam,mdittmer/foam,osric-the-knight/foam,jacksonic/foam,jlhughes/foam,foam-framework/foam,jlhughes/foam