Update get_csa_header to return none on CSAReadError#501

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parneshraniga wants to merge 4 commits intonipy:masterfrom

parneshraniga:master

Commits on Jan 3, 2017

Commits on Jan 4, 2017

Update csareader.py to fix style and add comments
parneshraniga
authored

Commits on Jan 12, 2017

Merge remote-tracking branch 'upstream/master'
parnesh-csiro
committed