Grow minor bugs

The above demonstrates some minor bugs that occur in flot charts using the Growing plugin.

Bugs demonstrated:

• Null data value bug

  The problem occurs when a data value is set to null. Thats because at the calculations, null (ex: used to discontinue a line in flot) is converted to a zero value.

• Growing Maximum Up with negative values

  The negative values representations do not animate.

• Growing Maximum Down with negative values

  The negative values start to animate from the top of the chart and stop the animation at zero.