IWSignaturePad demo generates an error

[jeroen.rottink]

Hi Alexandre,

Tested IWSignaturePad for the first time but see an DevTools console error. 

Code:

(index):53 Uncaught TypeError: Cannot read properties of null (reading 'getContext')
    at Initialize ((index):53:15)
    at HTMLDocument.<anonymous> ((index):98:23)


var c=IW.$("").getContext("2d");c.fillStyle="#FFFFFF";

The property HTMLName for the control is empty in TIWCustomCanvas.AddContext() when called from TIWCustomCanvas.InitControl()

Tested with IW15.2.64 running Chrome.

Update: Also when using the upload button on a 'big or complex' signature, the exception EIdReadLnMaxLineLengthExceeded is raised.