[views] csvexport accept an empty rset (closes #4236928) When you tried to apply the 'csvexport' view on an empty rset, the view couldn't be selected and you got a HTTP 500 error. Also add two new test cases.

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* {

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  color: #000 !important;

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}

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div#popupLoginBox,

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div#popupLoginBox,

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img#logo, div.header,

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#navColumnLeft, #navColumnRight,

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#footer {

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  display: none

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}

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div#pageContent{

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  border: none;

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}