insufficient logging on errors

I faced the following situation:

I tweaked cck field mapping using hook_apachesolr_cck_fields_alter. But I made a mistake when formatting a cck field which causes an exception on solr's side. But on drupal's side the only thing you see is a watchdog entry "500 Internal Server Error" but no further information. If you don't have access to solr's logfile it's impossible to find the reason why no more nodes get indexed.

So I created a patch that hands over detailed error messages from solr to drupal as exception which causes a more detailed watchdog entry. In my case it starts like this:

"500 Internal Server Error" Status:
HTTP Status 500 - Error while creating field 'ds_cck_field_event_date{type=date,properties=indexed,stored,omitNorms,sortMissingLast}' from value '2009-05-16T00:00:00'
...