Fix grp2idx empty output shape - #501
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grp2idx returned an incorrectly shaped output for empty numeric vectors. MATLAB returns an empty column vector with size 0x1, while Octave returned an empty 0x0 matrix. This happened because unique (s(:)) returns g with size 0x0 when the input is empty. Fixed by ensuring an empty g has size 0x1.
BEFORE:
AFTER:
MATLAB:
>> [g, gn, gl] = grp2idx(zeros(0, 1));
>> size(g)