[script][figure,test_script] Fix nbins for hist: only depends on the #histos in the figure

bob/measure/script/figure.py

@@ -565,7 +565,7 @@ class Hist(PlotBase):
         self._nbins = ctx.meta.get('n_bins', ['doane'])
         self._nhist_per_system = nhist_per_system
         self._nbins = check_list_value(
-            self._nbins, self.n_systems * nhist_per_system, 'n_bins',
+            self._nbins, nhist_per_system, 'n_bins',
             'histograms')
         self._thres = ctx.meta.get('thres')
         self._thres = check_list_value(

bob/measure/test_script.py

@@ -136,14 +136,14 @@ def test_hist():
         result = runner.invoke(commands.hist, ['--criterion',
                                                'min-hter', '--no-line',
                                                '--output', 'HISTO.pdf',  '-b',
-                                               '30,100,30,100', dev1, dev2])
+                                               '30,100', dev1, dev2])
         if result.output:
             click.echo(result.output)
         assert result.exit_code == 0, (result.exit_code, result.output)
 
     with runner.isolated_filesystem():
         result = runner.invoke(commands.hist, ['-e', '--criterion', 'eer','--output',
-                                               'HISTO.pdf',  '-b',  '30,20,30,20',
+                                               'HISTO.pdf',  '-b',  '30,20',
                                                '-sp', 221, '-lg', 'A,B',
                                                dev1, test1, dev2, test2])
         if result.output: