From 9fa9ae56a75d218332140e7c0771a02155657aae Mon Sep 17 00:00:00 2001
From: Joshua Smith <jbsmith7741@gmail.com>
Date: Fri, 20 Aug 2021 08:45:38 -0600
Subject: [PATCH] fix empty slice bug (#23)

---
 unmarshal.go      | 3 +++
 unmarshal_test.go | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/unmarshal.go b/unmarshal.go
index dd80dfd..5ad9b2c 100644
--- a/unmarshal.go
+++ b/unmarshal.go
@@ -211,6 +211,9 @@ func SetField(value reflect.Value, s string, sField reflect.StructField) error {
 	case reflect.Slice:
 		// create a generate slice and recursively assign the elements
 		baseType := reflect.TypeOf(value.Interface()).Elem()
+		if s == "" { // ignore empty slices
+			return nil
+		}
 		data := strings.Split(s, separator)
 		slice := reflect.MakeSlice(value.Type(), 0, len(data))
 		for _, v := range data {
diff --git a/unmarshal_test.go b/unmarshal_test.go
index 5d358c6..c3315af 100644
--- a/unmarshal_test.go
+++ b/unmarshal_test.go
@@ -262,6 +262,10 @@ func TestUnmarshal(t *testing.T) {
 				IntsP: []*int{trial.IntP(1), trial.IntP(2), nil, trial.IntP(3)},
 			},
 		},
+		"empty slice": {
+			Input:    "?Ints=&Strings=",
+			Expected: &testStruct{},
+		},
 		"alias type (dessert)": {
 			Input:    "?Dessert=brownie",
 			Expected: &testStruct{Dessert: brownie},