Address issue #246.

[dotwilbert]

After proposed change, there is no error message, but instead:

>> Running: /usr/local/go/bin/guru -format json describe /tmp/_goclipse840241577367384989/src/describe_temp/describe.go:#8,#8
   with GOROOT: /usr/local/go
   with GOPATH: /tmp/_goclipse840241577367384989
{
    "mode": "describe",
    "describe": {
        "desc": "definition of package \"describe_temp\"",
        "pos": "/tmp/_goclipse840241577367384989/src/describe_temp/describe.go:1:9",
        "detail": "package",
        "package": {
            "path": "describe_temp",
            "members": [
                {
                    "name": "main",
                    "type": "func()",
                    "pos": "/tmp/_goclipse840241577367384989/src/describe_temp/describe.go:11:6",
                    "kind": "func"
                }
            ]
        }
    }
}   ^^^ Terminated, exit code: 0 ^^^

[paulvi]

So will this PR solve #246 ?