eva_get_views needs to check if get_option() returns NULL

Because of other modules I have found that sometimes the method $view_entity = $view->display_handler->get_option('entity_type'); can return NULL / FALSE. Causing errors and Notices, especially in eva_field_extra_fields();

EG:

Warning: array_keys() expects parameter 1 to be array, null given in eva_field_extra_fields() (line 34 of /sites/all/modules/common/eva/eva.module).

Warning: Invalid argument supplied for foreach() in eva_field_extra_fields() (line 36 of /sites/all/modules/common/eva/eva.module).

The attached patch mitigates this.