groupBy: If property is undefined or null, do not group it together #220
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Undefined or null implies the property is **not set** meaning do not group it, it is unique. This uses the key property, prefixed with `_$` to assign it a unique placeholder value and then assign the element itself to that value.
Therefore
```
[
{ "color": "red" },
{ "color": "red" },
{ "color": null }
]
```
Groups into:
{
"red": [{
"color":"red"
},{
"color":"red"
}]
},
{"_$3": [{
"color": null
}]
```
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Undefined or null implies the property is not set meaning do not group it, it is unique. This uses the key property, prefixed with
_$to assign it a unique placeholder value and then assign the element itself to that value.Therefore ng-repeat
Groups into: