DOC: Add examples and notes to empty documentation#12442

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masongallo wants to merge 4 commits intopandas-dev:masterfrom

masongallo:empty-clarity

Commits on Feb 24, 2016

Commits on Feb 25, 2016

Address feedback to include examples of empty and non-empty with NaNs
masongallo
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Add see also section and replace i.e. with meaning
masongallo
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