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 ?