Fix failure when nothing has changed in the HTML diff #184
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See for example https://github.com/rrthomas/hpmor/actions/runs/12793679166
This failed because the
hpmor-html-diff.log
file was 0 bytes (i.e. the diff was empty due to no textual changes).The fix is to tell the
diff
command to output "files are identical" in this case so that the log reflects this.