Adding test to demonstrate issue #474.
Adding test to demonstrate issue #474.

Model with multiple imports is parsed successfully but printing skips two of the three import
elements. All components seem to be there as the connections and encapsulation are correctly
printed.

MichaelClerx/libcellml,cellml/libcellml,cellml/libcellml,MichaelClerx/libcellml,nickerso/libcellml,MichaelClerx/libcellml,nickerso/libcellml,hsorby/libcellml,cellml/libcellml,hsorby/libcellml,nickerso/libcellml,hsorby/libcellml,hsorby/libcellml,cellml/libcellml,nickerso/libcellml