<canvas class="pad" width="300" height="55" data-object="signature-display" data-signature-string="<%= object.get_response(:raw) %>"></canvas>

<canvas class="pad" width="300" height="55" data-object="signature-display" data-signature-string="<%= object.get_response(:raw) if object %>"></canvas>

Check if object exists first before trying signature
Check if object exists first before trying signature
