Dev fix: Fix case where trying to select row index 0

- row(0) was failing due to a logic error in the selector, which was
  ignoring the 0, or rather, treating it like an empty selector.

media/src/api/api._selectors.js

@@ -238,14 +238,14 @@ var _row_selector = function ( settings, selector, opts )
 
 		var rows = _row_selector_indexes( settings, opts );
 
-		if ( ! sel ) {
+		if ( selInt !== null && $.inArray( selInt, rows ) !== -1 ) {
-			// Selector - none
-			return rows;
-		}
-		else if ( selInt && $.inArray( selInt, rows ) !== -1 ) {
 			// Selector - integer
 			return [ selInt ];
 		}
+		else if ( ! sel ) {
+			// Selector - none
+			return rows;
+		}
 
 		// Get nodes in the order from the `rows` array (can't use `pluck`) @todo - use pluck_order
 		var nodes = [];