[SPARK-18398][SQL] Fix nullabilities of MapObjects and ExternalMapToCatalyst.#15840

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Commits on Nov 10, 2016

Fix nullabilities of MapObjects and optimize not to check null if lambda is not nullable.
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Commits on Nov 11, 2016

Use `ctx.nullSafeExec()` to generate nullability checking in `MapObjects`.
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Commits on Nov 14, 2016

Use `ctx.nullSafeExec()` to generate nullability checking.
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Fix nullability of map values of `ExternalMapToCatalyst`.
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Use `ctx.nullSafeExec()` to generate nullability checking in complex type creators.
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