[Regression] Ensure that PDFFindBar.updateResultsCount
doesn't throw when the viewer is closed, by providing proper default values
#10056
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The error can be reproduced by opening any file in the viewer, and then running
PDFViewerApplication.close()
in the console./cc @timvandermeij
/cc @rvandermeulen
Edit: Fixes https://bugzilla.mozilla.org/show_bug.cgi?id=1489996#c2