## Overview
Handle db deletion in couch_db:load_validation_funs
Previously there were few problems with load_validation_funs
in the case when clustered database is deleted.
- the calls to load_validation_funs were failing with `internal_server` error
[1]
- the deleted database stayed opened because:
- the caller of the load_validation_funs (update_doc) stayed alive
- the main_pid of the deleted database wasn't killed either
- there was an infinite loop in ddoc_cache_entry trying to recover ddoc from
deleted database
The solution is:
- do not call `recover` for deleted database
- close `main_pid`
- use `erlang:error` to crash the caller
[1] - The stack trace was:
```
{database_does_not_exist,[
{mem3_shards,load_shards_from_db,"bailey/meta",[
{file,"src/mem3_shards.erl"},{line,394}]},
{mem3_shards,load_shards_from_disk,1,[
{file,"src/mem3_shards.erl"},{line,369}]},
{mem3_shards,for_db,2,[
{file,"src/mem3_shards.erl"},{line,54}]},
{fabric_view_all_docs,go,5,[
{file,"src/fabric_view_all_docs.erl"},{line,24}]},
{ddoc_cache_entry_validation_funs,recover,1,[
{file,"src/ddoc_cache_entry_validation_funs.erl"},{line,33}]},
{ddoc_cache_entry,do_open,1,[
{file,"src/ddoc_cache_entry.erl"},{line,294}]}]}
```
## Testing recommendations
```
make eunit apps=couch tests=clustered_db_test
make eunit apps=ddoc_cache
```
## Related Issues or Pull Requests
N/A
## Checklist
- [x] Code is written and works correctly;
- [x] Changes are covered by tests;
- [ ] Documentation reflects the changes;
[ Full content available at: https://github.com/apache/couchdb/pull/1629 ]
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