Error intercepting in MVC when saving data

I have seen many times in MVC the following code,when doing a post and saving data :

try
{
        //code to save to database
}
catch
{
         ModelState.AddRuleViolations(TheModel.GetRuleViolations());
}

Why is not good ?
I will do a simple example : if some error occurs on the database level ( such as simple unique index on a name column ) or even some error occurs whenestablishing the database connection – you will never see what’s happening. And you will have no chance to repair the problem
A slighty better code is :

try
{
     ModelState.AddRuleViolations(TheModel.GetRuleViolations());
     if(ModelState.Count == 0)// no error in the model
     {
     //code to save to database
     }
}
catch(Exception ex)
{
      ModelState.AddModelError("",ex.Message);
}

Please see also how to do logging to the exception at
http://msprogrammer.serviciipeweb.ro/2010/04/19/logging-and-instrumentation/