AlexanderKaraberov opened a new pull request #1166: Fix: fix `badmatch` crash 
in couch_mrview_util.erl reduced_external_size()
   ## Overview
   When we tested CouchDB 2.1 with our production DB which contains gazillion 
of different documents `couch_mrview_util:reduced_external_size()` crashed with 
`badmatch` error randomly because of some broken docs in our DB. This is 
because `full_reduce` returned response in the format `{_, _}` (no nested 
tuple)  and not `{ok, {_, _}}` as was expected there. After this crash CouchDB 
was broken completely for me. In order to fix this I added an additional 
"match-anything" case clause, because even if we had something really broken in 
our DB, CouchDB still should handle this more gracefully I believe. 
   P.S. I wasn't sure what is better: add a wildcard `_` after `{ok, {_, _}} -> 
0` or  just replace latter with it. Feel free to suggest.
   ## Testing recommendations
   Unfortunately can't describe formal steps because this thing happened 
randomly for us several times on one of the production databases. But I think 
expecting that `full_reduce` may return another response is good instead of 
crashing Couch and polluting logs.
   ## Checklist
   - [ ] Code is written and works correctly;
   - [ ] Changes are covered by tests;
   - [ ] Documentation reflects the changes;

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