ERR: Fix GH13139: better error message on invalid pd.eval and df.query input#14473

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tserafim:issue#13139

Commits on Oct 22, 2016

Fix GH13139: better error message on invalid pd.eval and df.query input
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Commits on Oct 24, 2016

ERR: correctly raise ValueError on empty input to pd.eval() and df.query() (#13139)
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