Fixes update-assign with collect object issue #830

pkg/yqlib/operator_collect_test.go

@@ -5,6 +5,14 @@ import (
 )
 
 var collectOperatorScenarios = []expressionScenario{
+	{
+		skipDoc:    true,
+		document:   ``,
+		expression: `.a += [0]`,
+		expected: []string{
+			"D0, P[], ()::a:\n    - 0\n",
+		},
+	},
 	{
 		description: "Collect empty",
 		document:    ``,