simplify count

[shmax]

Another subtle fix. Apparently, rails does not throw an exception if you do a where with an empty array. Both of these should return an empty array, not throw:

Author::where(['author_id IN(?)', []])->to_a();

Author::where(['author_id' => []])->to_a();

Rails optimize this under the hood by just doing an always-false clause, ie:

WHERE 1=0

[codecov]

Codecov Report

Merging #110 (399a14e) into master (d135bd1) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##              master      #110   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
- Complexity       936       937    +1     
===========================================
  Files             34        34           
  Lines           2349      2349           
===========================================
  Hits            2349      2349           

Files	Coverage Δ
lib/WhereClause.php	100.00% <100.00%> (ø)

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