better null check for stack (closes #354)
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		@@ -718,7 +718,7 @@ var Reveal = (function(){
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	function setPreviousVerticalIndex( stack, v ) {
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		if( stack ) {
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		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' ) {
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			stack.setAttribute( 'data-previous-indexv', v || 0 );
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		}
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@@ -733,7 +733,7 @@ var Reveal = (function(){
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	 */
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	function getPreviousVerticalIndex( stack ) {
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		if( stack && stack.classList.contains( 'stack' ) ) {
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		if( typeof stack === 'object' && typeof stack.setAttribute === 'function' && stack.classList.contains( 'stack' ) ) {
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			return parseInt( stack.getAttribute( 'data-previous-indexv' ) || 0, 10 );
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		}
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