Not outputting the global variables if no outputs are set.

cli.go

@@ -22,10 +22,12 @@ func cmdList(stdout io.Writer, stderr io.Writer, s *state) int {
 		}
 	}
 
+	if(len(s.outputs()) > 0) {
 		groups["all"] = make(map[string]string, 0)
 		for _, out := range s.outputs() {
 			groups["all"].(map[string]string)[out.keyName] = out.value
 		}
+	}
 
 	return output(stdout, stderr, groups)
 }

fixtures/playbook.yml

@@ -1,5 +1,5 @@
 - hosts:
-    - web-aws
-    - web-do
+    - alpha
+    - beta
   tasks:
     - command: "echo Hello, world!"