FIX: Size check to avoid range-check-exception

[RadiRadiesel2]

Hi Eric, at some point, when trying to write empty string with the TgoBsonWriter, there is a range-check-exception (obviously only if range-check is active in compiler settings). In my case, when entering the function, I had the following szenario:

• passed ASize=0 (empty string)
• FCapacity=512
• FSize=512 So we're exactly at the buffer border. But since ASize=0, the comparison if ((FSize + ASize) > FCapacity) then is not true and FCapacity does not get doubled. Therefore Move(AValue, FBuffer[FSize], ASize); will result in a range-check-exception. Changing the above line to if ((FSize + ASize) >= FCapacity) then would solve the problem, too, but since we didn't want to write anything (empty string, ASize=0), neither Move() not Inc() does make any sense. This is why I think checking for ASize > 0 is the better fix. Thanks and best regards Michael

[erikvanbilsen]

Thank you for this contribution! I merged the fix.