CI's staticcheck does not treat t.Fatal as terminating, so every
`err.Message` deref sitting after a separate `if err == nil { t.Fatal(...) }`
block is flagged SA5011 (possible nil dereference). Collapse all 26
occurrences in TestNoHTML / TestPrintableText / etc. into a guarded
`} else if`, matching the fix already applied to validator_format_test.go
in bca36636f. The deref now lives in a branch where err is provably
non-nil, which satisfies SA5011 regardless of t.Fatal recognition.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
