fixed Issue 103:  	 When only 'Use Default Assignment Rule' is checked on Settings, error is thrown on save
fixed Issue 103:  	 When only 'Use Default Assignment Rule' is checked on Settings, error is thrown on save

ganesh-sfdc/forceworkbench,gmathrubootham/forceworkbench,robbyrob42/forceworkbench,ganesh-sfdc/forceworkbench,tectronics/forceworkbench,Letractively/forceworkbench,gmathrubootham/forceworkbench,tectronics/forceworkbench,google-code-export/forceworkbench,gmathrubootham/forceworkbench,robbyrob42/forceworkbench,gmathrubootham/forceworkbench,robbyrob42/forceworkbench,Letractively/forceworkbench,google-code-export/forceworkbench,ganesh-sfdc/forceworkbench,Letractively/forceworkbench,ganesh-sfdc/forceworkbench,tectronics/forceworkbench,google-code-export/forceworkbench