[changeset] problems with cla()

[Ben Abbott]

I noticed that clearing an axes twice ...

octave:73> clear all
octave:74> plot(1:10)
octave:75> cla
octave:76> cla
error: invalid vector index = 1
error: called from:
error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/plot/findobj.m at line 75, column 5
error:   /Users/bpabbott/Development/mercurial/octave-3.1.51/scripts/plot/cla.m at line 74, column 8

Changeset is attached.

Ben


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