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Modify cursor.fetchmany() to break after no results #62

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mkmoisen
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Currently, if you call cur.fetchmany(1000) while there is only 1 row left to fetch, the loop will call self.fetchone() 1000 times and will return an array of size 1000, where 999 values are None.

This file change breaks out of the loop if self.fetchone() returns None to prevent this behavior, exactly what fetchall() does.

Currently, if you call `cur.fetchmany(1000)` while there is only 1 row left to fetch, the loop will call `self.fetchone()` 1000 times and will return an array of size 1000, where 999 values are None. 

This file change breaks out of the loop if `self.fetchone()` returns None to prevent this behavior, exactly what `fetchall()` does.
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