fix for station scatter error

pylot/RELEASE-VERSION

@@ -1 +1 @@
-fce0c-dirty
+413a-dirty

pylot/core/util/map_projection.py

@@ -271,8 +271,14 @@ class map_projection(QtGui.QWidget):
         if hasattr(self, 'cid'):
             self.canvas.mpl_disconnect(self.cid)
             del(self.cid)
-        self.sc.remove()        
-        self.legend.remove()
+        try:
+            self.sc.remove()
+        except Exception as e:
+            print('Warning: could not remove station scatter plot.\nReason: {}'.format(e))
+        try:
+            self.legend.remove()
+        except Exception as e:
+            print('Warning: could not remove legend. Reason: {}'.format(e))
         self.canvas.draw()
 
     def remove_contourf(self):