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Parents and children of check-in [1964e656]

Fix a (almost always harmless) read past the end of a memory allocation that comes about because the Expr.pTab field is checked on an EXPR_REDUCEDSIZE Expr object before checking the Expr.op field to know that the Expr.pTab field is meaningless. (check-in: e098de69 user: drh tags: trunk)
The va_list argument cannot take on a NULL value and cannot be compared with NULL on some platforms (ex: ARM). So do not attempt to do so. (check-in: 1964e656 user: drh tags: trunk)
In the command-line shell, make sure stderr is unbuffered so that it automatically flushes. This has always been the case already for unix and on Windows when the output is a console, but apparently was not the case on Windows when the output was a pipe. (check-in: 2a9ea9b4 user: drh tags: trunk)