[Commotion-admin] [luci-commotion-apps] r1: Input validation fails and causes permanent breakage (#47)

[areynold]

When adding a new app, use "../commotion_index.htm%20" in the image field. You should get something like this:

```
500 Internal Server Error

Sorry, the server encountered an unexpected error.

/usr/lib/lua/luci/dispatcher.lua:448: Failed to execute call dispatcher target for entry '/apps'.
The called action terminated with an exception:
/usr/lib/lua/luci/template.lua:104: Failed to execute template 'commotion/apps_view'.
A runtime error occured: /usr/lib/lua/luci/template.lua:104: Failed to execute template 'commotion/apps_display'.
A runtime error occured: [string "/usr/lib/lua/luci/view/commotion/apps_displ..."]:18: attempt to concatenate a nil value
stack traceback:
	[C]: in function 'assert'
	/usr/lib/lua/luci/dispatcher.lua:448: in function 'dispatch'
	/usr/lib/lua/luci/dispatcher.lua:195: in function 
```

Not sure if this belongs to @elationfoundation or @dismantl 

---
Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion-apps/issues/47
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