Bug when trying to show SVG content

[jfhenon]

Describe the bug
Bug when trying to show SVG content when the context is changed.

To Reproduce
Steps to reproduce the behavior:

1. Load the following sampe SVG:

<svg width="640" height="480" xmlns="http://www.w3.org/2000/svg" xmlns:svg="http://www.w3.org/2000/svg">
 <!-- Created with SVG-edit - https://github.com/SVG-Edit/svgedit-->
 <g class="layer">
  <title>Layer 1</title>
  <g id="svg_6">
   <rect fill="#FF0000" height="71" id="svg_1" stroke="#000000" stroke-width="5" width="94" x="69.5" y="51.5"/>
   <circle cx="117.5" cy="87.5" fill="#ffff00" id="svg_5" r="19.84943" stroke="#000000" stroke-dasharray="null" stroke-linecap="null" stroke-linejoin="null" stroke-width="5"/>
  </g>
 </g>
</svg>

2. move the context to the group by double-click on the rectangle
   
3. click on the following button
4. the action will fail and an error is displayed in the console:
   
   Expected behavior
   A window with the SVG content should be displayed.

SVG-Edit environment (IMPORTANT)
https://unpkg.com/svgedit@5.1.0/editor/svg-editor.html

Desktop (please complete the following information):

• OS: MacOS
• Browser Chrome
• Version 81.0.4044.113

Screenshots
see above

Log
see above

Additional context
Add any other context about the problem here.

svgedit/editor/svgcanvas.js

Line 695 in 4b92acc

if (showGrips || selectedElements.length === 1) {

This seems to related to the conditional statement above. If showGrip is false or undefined AND selectedElements.length == 0, it fails on the statement selectorManager.requestSelector.

should it be the following?

if (selectedElements.length === 1) {
  selectorManager.requestSelector(selectedElements[0]).showGrips(showGrips)
}

[brettz9]

Hi @jfhenon .... Is there anything left outstanding on this?