BaseActiveRecord save method behaviour

[Jaak Tamre]

When calling save() on a model object, it hints that it returns true or false whether save succeeded. It does not hint any exceptions are thrown, however it calls insert() or update() which can throw db\Exception or Throwable.
So when the database configuration is wrong or database is not responsing then an Exception is thrown from save() and causes an unexpected error.

Either:
a) the exceptions should be caught within save(), logged and returns false
b) PHP doc for save() needs to be updated with [at]throws statement, so IDE's can detect it needs exception handling

[Alexander Makarov]

Solution b) is preferred. Could you make a pull request?