Handle scalars in property files

pkg/yqlib/properties_test.go

@@ -162,6 +162,14 @@ var propertyScenarios = []formatScenario{
 		expected:     "mike: ${dontExpand} this\n",
 		scenarioType: "decode",
 	},
+	{
+		description:  "print scalar",
+		skipDoc:      true,
+		input:        "mike = cat",
+		expression:   ".mike",
+		expected:     "cat\n",
+		scenarioType: "roundtrip",
+	},
 	{
 		description:  "Roundtrip",
 		input:        expectedPropertiesUnwrapped,