preproc: Don't access out of bound data on malformed input

There are a number of places still where we test text
data which is potentially may be an empty string. This
is known to happen on fuzzer input but usually doesn't
take place in regular valid programs. Surely we need
to revisit preprocessor code for this kind of errors.

https://bugzilla.nasm.us/show_bug.cgi?id=3392525

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

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