#1 BacktrackingParser: Parsing an empty stream leads Exception

[Uwe Voigt]

java.lang.ArrayIndexOutOfBoundsException: 0
at lpg.lpgjavaruntime.IntTuple.add(IntTuple.java:75)
at
lpg.lpgjavaruntime.BacktrackingParser.parse(BacktrackingParser.java:129)

adding one to the size of the newly created array would
smoothly fix this issue

System.arraycopy(array, 0, array = new int[i * 2 + 1],
0, i);
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