Missing bucket type name should be logged [JIRA: RIAK-2410]

[joecaswell]

When a value in a typed bucket type in a backend, but the bucket type does not exist, riak_core_bucket:get_bucket returns {error, no_type}. The resulting error message below does not show the name of the missing type. In order to fix this the operator must run a full keylist and verify every bucket type encountered.

2016-02-22 10:05:58 =ERROR REPORT====
Error in process <0.3615.0> on node 'riak@127.0.0.1' with exit value: {function_clause,[{proplists,get_value,[n_val,{error,no_type},undefined],[{file,"proplists.erl"},{line,225}]},{riak_kv_util,get_index_n,1,[{file,"src/riak_kv_util.erl"},{line,190}]},{yz_index_hashtree,'-fold_keys/2-fun-0-',2,[{file,"src/yz_index_hashtree.erl"},{line,306}]},{lists,foreach,2,[{file,"lists.erl"},{line,1323}]},{yz_entropy,iterate_entropy_data,4,[{file,"src/yz_entropy.erl"},{line,47}]},{yz_index_hashtree,'-fold_keys/2-lc$^0/1-0-',3,[{file,"src/yz_index_hashtree.erl"},{line,310}]},{yz_index_hashtree,fold_keys,2,[{file,"src/yz_index_hashtree.erl"},{line,310}]},{yz_index_hashtree,build_or_rehash,4,[{file,"src/yz_index_hashtree.erl"},{line,555}]}]}