[SPARK-17916][SQL] Fix new behavior when quote is set and fix old behavior when quote is unset#22312

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koertkuipers wants to merge 2 commits intoapache:masterfrom

tresata-opensource:feat-csv-null-unquoted

Commits on Sep 1, 2018

fix new behavior when quote is changed and fix old behavior when quote is unset
koertkuipers
committed
minimize changes, also there is no point in quoting empty strings if null value is also set to empty string
koertkuipers
committed