Python: skip empty and whitespace-only instructions in prepend - #8524
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Only None short-circuited before; an instructions value of "" (the usual unset-options default) still injected a system message with empty content ahead of the conversation. Empty and all-whitespace entries are dropped, and a real instruction prepends verbatim. Signed-off-by: Manohar Paturi <186662190+ManoharPaturi@users.noreply.github.com>
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Fixes #8523.
Drops empty and whitespace-only instruction entries before building messages, so an unset instructions default adds no message. Real instructions are prepended verbatim, including their own surrounding whitespace.
3 tests (empty string adds nothing, whitespace-only adds nothing, real instruction verbatim); the first two fail on main. Types suite green.