Update test_plot.py

removed plt.show() call

Author: Jhsmit

test/test_plot.py

@@ -586,5 +586,4 @@ def test_hist_phi_storm(self):
     def test_misc(self):
         fig = self.clp.figure()
         self.clp.savefig('deleteme.png')
-        self.clp.show()
-        plt.close()
+        plt.close()