Inits `o->value` in `check_expr_base_internal()` so doesn't accidentally
use last (the proc lit was being set to that of previous string)
Adds test to "tests/issues" and changes CI to use new "run" shells
Changes lb_build_if_stmt() to return null lbValue if condition is
cmpAnd, cmpOr or non-const neg and check in lb_build_if_stmt()
to avoid short circuiting if that's the case
Adds test to "tests/issues" and adds step in CI to check this dir