charsets: set error if UTF-8 validation fails
Otherwise, mm_modem_charset_bytearray_to_utf8() may return NULL without error set, and that will trigger a crash in the caller.
Fixes #511 (closed)
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Otherwise, mm_modem_charset_bytearray_to_utf8() may return NULL without error set, and that will trigger a crash in the caller.
Fixes #511 (closed)