BarChart throws error when the y value of all bars is 0

**Describe the bug**
Getting the below error when all the bars have 0 as there y-axis value in a BarChart-
!offset.dx.isNaN && !offset.dy.isNaN
"Offset argument contained a NaN value."
[error.log](https://github.com/imaNNeoFighT/fl_chart/files/9062883/error.log)

**To Reproduce**
To reproduce, pass all y values as 0 (empty graph)

**Versions**
- which version of the Flutter are you using? - 3.0.2
- which version of the FlChart are you using? - 0.51.0

Start by reproducing the BarChart with all y values set to 0 using Flutter 3.0.2 and fl_chart 0.51.0, then trace the BarChart rendering path associated with the reported NaN Offset error. Done means an all-zero dataset renders as an empty graph without throwing the assertion.

Written by the indexing model from the issue text.