null values

[Jarosław Pękala <jaroslaw.pekala@…>]

When data contains nulls like:

Sp_data	Ideal	Real
2013-06-22 00:00:00+02:00	39	39
2013-06-22 00:00:00+02:00		39
2013-06-23 00:00:00+02:00	36
2013-06-24 00:00:00+02:00	33	32

error is raised:

All series on a given axis must be of the same data type

when null value is replaced by exact value ex:

Sp_data	Ideal	Real
2013-06-22 00:00:00+02:00	39	39
2013-06-22 00:00:00+02:00	1	39
2013-06-23 00:00:00+02:00	36	1
2013-06-24 00:00:00+02:00	33	32

chart is ok

I added to [vis] in trac.ini:

options = interpolateNulls:true

but result is the same as without this line.