https://issues.apache.org/jira/browse/TINKERPOP-2312
Basically, this:
```text
gremlin> g.V().group().by('age')
The property does not exist as the key has no associated value for the provided
element: v[3]:age
Type ':help' or ':h' for help.
Display stack trace? [yN]n
```
now does this:
```text
gremlin> g.V().groupCount().by('age')
==>[null:2,32:1,35:1,27:1,29:1]
```
which has its conveniences but also produces a result that would be easier to
follow for new users as opposed to the old exception.
All tests pass with `docker/build.sh -t -n -i`
VOTE +1
[ Full content available at: https://github.com/apache/tinkerpop/pull/1240 ]
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