bicycle-statistics: Fix memory leak

Signed-off-by: Thomas Klaehn <thomas.klaehn@u-blox.com>

gpx2html/__init__.py

@@ -45,6 +45,7 @@ def plot_bar_chart(labels, ticklabels, values, title, xlabel, ylabel, filename,
 
     plt.legend()
     plt.savefig(filename)
+    plt.close('all')
 
 class Gpx2Html(object):
     def __init__(self, infolder, outfolder, logger):
@@ -52,6 +53,9 @@ class Gpx2Html(object):
         self.infolder = infolder
         self.outfolder = os.path.abspath(outfolder)
 
+        if not os.path.exists(self.outfolder):
+            os.makedirs(self.outfolder)
+
         self.tracks = Tracks(logger)
         self.update()