Fix some imexam cursor problems #191
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Sometimes, the argument is just empty, which caused a crash before.
The arglen (originally 16 bit) may be added to the intruction pointer, and the result may exceed 16 bit.
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There were two problems: First,
IrafGWcs.set(arg)is sometimes called with an empty argument instead of None, which then produced an Exception. Then, the addition ofnp.int16andintnow results in annp.int16, which sill cause an overflow inGkiBuffer.getNextCode().Together with #188, this may fix #181; however I can't reproduce this completely.