fix error logout with try catch

log error :
08-13 16:57:22.187: E/TiRHelper(4582): java.lang.NoSuchFieldException:
fr_Home_mainView_buttons_container_facebook_register
08-13 16:57:22.943: E/AndroidRuntime(4582): 	at
com.facebook.internal.Utility.clearCookiesForDomain(Utility.java:444)
08-13 16:57:22.943: E/AndroidRuntime(4582): 	at
com.facebook.internal.Utility.clearFacebookCookies(Utility.java:468)
08-13 16:57:22.943: E/AndroidRuntime(4582): 	at
com.facebook.Session.closeAndClearTokenInformation(Session.java:802)
08-13 16:57:22.943: E/AndroidRuntime(4582): 	at
com.facebook.android.Facebook.logoutImpl(Facebook.java:704)
08-13 16:57:22.943: E/AndroidRuntime(4582): 	at
com.facebook.android.AsyncFacebookRunner$1.run(AsyncFacebookRunner.java:
89)