Fix: error creating env0 resources (#365)

env0/resource_configuration_variable.go

@@ -195,7 +195,10 @@ func getEnum(d *schema.ResourceData, selectedValue string) ([]string, diag.Diagn
 	if specified, ok := d.GetOk("enum"); ok {
 		enumValues = specified.([]interface{})
 		valueExists := false
-		for _, enumValue := range enumValues {
+		for i, enumValue := range enumValues {
+			if enumValue == nil {
+				return nil, diag.Errorf("an empty enum value is not allowed (at index %d)", i)
+			}
 			actualEnumValues = append(actualEnumValues, enumValue.(string))
 			if enumValue == selectedValue {
 				valueExists = true

env0/resource_configuration_variable_test.go

@@ -323,6 +323,27 @@ resource "%s" "test" {
 		runUnitTest(t, createTestCase, func(mock *client.MockApiClientInterface) {})
 	})
 
+	t.Run("Create Enum with empty value", func(t *testing.T) {
+		stepConfig := fmt.Sprintf(`
+		resource "%s" "test" {
+			name = "%s"
+			description = "%s"
+			value= "%s"
+			enum = ["a",""]
+		}`, resourceType, configVar.Name, configVar.Description, configVar.Value)
+
+		createTestCase := resource.TestCase{
+			Steps: []resource.TestStep{
+				{
+					Config:      stepConfig,
+					ExpectError: regexp.MustCompile(`an empty enum value is not allowed \(at index 1\)`),
+				},
+			},
+		}
+
+		runUnitTest(t, createTestCase, func(mock *client.MockApiClientInterface) {})
+	})
+
 	t.Run("Create with wrong type", func(t *testing.T) {
 		createTestCase := resource.TestCase{
 			Steps: []resource.TestStep{