Notice: Undefined index: is_deceased
It's nothing to be worried about, though it is a minor bug.  The code there happens to look for the value of $defaults['is_deceased'] without checking to see if the $defaults array has a value with the key is_deceased.  Two things:


You might record an issue at https://issues.civicrm.org so it gets fixed.
You should probably turn off the error messages if this is a production site.  In the Drupal admin menu, go to Configuration, then under Development see Logging and Errors.  Select none under "Error messages to display" and save the configuration.  (This, by the way, is why a notice like this goes unnoticed.)