cellstr & strcat matlab inconsistency

[Jaroslav Hajek]

Hi,

in current Octave strcat ("", "ab") produces an error instead of the
obvious desired result.
The problem can be fixed by having cellstr ('') producing {''} instead
of {}, which is also consistent with Matlab.
Attached is the change plus a test in strcat.m

-- 
RNDr. Jaroslav Hajek
computing expert
Aeronautical Research and Test Institute (VZLU)
Prague, Czech Republic
url: www.highegg.matfyz.cz
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