[fix bug] crash on open.

[jiangzhibin]

while plugin's owner is nil, here will crash:
location: STPluginCellView.m -(void)populate line:34.

you can replace the code to fix the crash:

[jiangzhibin]

I had pull a new request.
#82

[jiangzhibin]

I had modified the source code, and recompile a Sketch-Toolbox to fix this bug, Everyone can download it on my github.
https://github.com/jiangzhibin/Sketch-Toolbox-app.git

[Klemart3D]

Or change it to another unbugged and maintained Sketch plugins manager like:
https://mludowise.github.io/Sketch-Plugin-Manager/
https://sketchpacks.com/

Dupe of #80

[adamkirkwood]

@Klemart3D @jiangzhibin @JHabdas Thanks for the mention.

As of Sketchpacks 0.6.0, you now have the ability to manage and sync your Sketch plugins across machines and teams.