Added default value for graphType.
Added default value for graphType.

Otherwise, if none is set, object ‘p’ is not initialized and execution halts.

thehyve/Rmodules,UMich-Neptune-Transmart/Rmodules,wimvanderlinden/Rmodules,thehyve/Rmodules,wimvanderlinden/Rmodules,thehyve/Rmodules_oncoprint,cdejonge/Rmodules,transmart/Rmodules,UMich-Neptune-Transmart/Rmodules,thehyve/heim-Rmodules,baumjamin/Rmodules,UMich-Transmart/Rmodules,baumjamin/Rmodules,UMich-Neptune-Transmart/Rmodules,thehyve/Rmodules,cdejonge/Rmodules,UMich-Neptune-Transmart/Rmodules,UMich-Transmart/Rmodules,thehyve/Rmodules_oncoprint,transmart/Rmodules,transmart/Rmodules,thehyve/Rmodules,thehyve/Rmodules_oncoprint,wimvanderlinden/Rmodules,UMich-Transmart/Rmodules,baumjamin/Rmodules,thehyve/heim-Rmodules,baumjamin/Rmodules,thehyve/heim-Rmodules,transmart/Rmodules,wimvanderlinden/Rmodules,UMich-Transmart/Rmodules,cdejonge/Rmodules,thehyve/heim-Rmodules,cdejonge/Rmodules