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demos/demo_beats_and_tempo.py: skip plot if not beats

--- a/python/demos/demo_beats_and_tempo.py

+++ b/python/demos/demo_beats_and_tempo.py

@@ -31,9 +31,11 @@

 periods = [60./(b - a) for a,b in zip(beats[:-1],beats[1:])]

 from numpy import mean, median

-print 'mean period:', mean(periods), 'bpm'

-print 'median period:', median(periods), 'bpm'

-

-from pylab import plot, show

-plot(beats[1:], periods)

-show()

+if len(periods):

+    print 'mean period:', "%.2f" % mean(periods), 'bpm', 'median', "%.2f" % median(periods), 'bpm'

+    if 0:

+        from pylab import plot, show

+        plot(beats[1:], periods)

+        show()

+else:

+    print 'mean period:', "%.2f" % 0, 'bpm', 'median', "%.2f" % 0, 'bpm'