Correct figure lollipop with 2d axis

navipy/trajectories/__init__.py

@@ -792,6 +792,7 @@ series.
                 fig = plt.figure()
                 ax = fig.add_subplot(111, projection='3d')
             elif len(plotcoords) == 2:
+                fig = plt.figure()
                 ax = fig.add_subplot(111)
         if (len(plotcoords) != 2) and (len(plotcoords) != 3):
             msg = 'plotcoords need to contains 2 or 3 elements'