A "divide by 0" bug

[lionhylra]

In the file ChartYAxisRenderer.swift, line 136 : There is a small chance that the interval is 0(e.g. I set rightYAxis.granularity = 0.001 or a smaller number).

I recommend adding guard interval != 0 else {return} at line 136 .

Otherwise it might cause error when calculating last which finally crash app.

Screenshot

[danielgindi]

The problem seems to actually be the interval of the for-loop. It should be converted to a stride

[lionhylra]

Even when the for loop is converted to a stride, if the interval is 0, then first and last will become "NaN" which break the stride leading to a crash

[danielgindi]

This does not happen anymore with the latest changes, you can checkout the code from master.