cond gives a warning due to isstr

[Michael Creel]

I ran into a minor issue with cond - it uses isstr instead of ischar:
octave:1> version
ans = 3.0.1
octave:2> cond(1)
warning: isstr is obsolete and will be removed from a future version of
Octave, please use ischar instead
ans =  1
octave:3>

Michael
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