Fix GraphWidget.update() crashing when called without vprops or eprops argument.

This fixes interactive_window() crashing when called with window argument but without vprops or eprops.
4 jobs for patch-1 in 119 minutes and 26 seconds (queued for 21 minutes and 40 seconds)
Status Name Job ID Coverage
  Test
passed job_clang_amd64 #5035
amd64

00:59:32

passed job_clang_cxx_amd64 #5023
amd64

00:59:53

passed job_gcc_amd64 #5021
amd64

00:48:19

failed job_clang_amd64 #5022
amd64

01:05:00