tools sets: show warming if a set has no tools

Testing #250309


Create the following tool set:
```
{
	"test1": {
		"tools": [
			
		],
		"description": "no tools",
		"icon": "arrow-both"
	},
}
```

You could show a warning on the tools array by using `minItems`
```
{
  "type": "array",
  "minItems": 1,
  "items": {
    "type": "string"
  }
}
```