Fix templating init with options field and add unit test (grafana-too…

…ls#173)

board.go

@@ -85,7 +85,7 @@ type (
 		AutoCount   *int        `json:"auto_count,omitempty"`
 		Datasource  *string     `json:"datasource"`
 		Refresh     BoolInt     `json:"refresh"`
-		Options     []Option    `json:"options"`
+		Options     []Option    `json:"options,omitempty"`
 		IncludeAll  bool        `json:"includeAll"`
 		AllFormat   string      `json:"allFormat"`
 		AllValue    string      `json:"allValue"`

rest-dashboard_test.go

@@ -410,3 +410,52 @@ func TestCustomPanelSerialization(t *testing.T) {
 		t.Fatalf("expected to not have any CustomPanel keys, got: %v", cnt)
 	}
 }
+
+func TestTemplatingOptionsSerialization(t *testing.T) {
+
+	for i := 0; i < 2; i++ {
+
+		var options []sdk.Option = nil
+
+		if i == 1 {
+			options = []sdk.Option{{}}
+		}
+
+		board := &sdk.Board{
+			Templating: sdk.Templating{List: []sdk.TemplateVar{
+				{
+					Options: options,
+				},
+			}},
+		}
+
+		boardJson, err := json.Marshal(board)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		var boardMap map[string]interface{}
+
+		err = json.Unmarshal(boardJson, &boardMap)
+		if err != nil {
+			t.Fatal(err)
+		}
+
+		templatingMap, found := boardMap["templating"].(map[string]interface{})
+		if !found {
+			t.Fatal()
+		}
+
+		list, found := templatingMap["list"].([]interface{})
+		if !found {
+			t.Fatal()
+		}
+
+		_, found = list[0].(map[string]interface{})["options"]
+		if options == nil && found {
+			t.Fatal()
+		} else if options != nil && !found {
+			t.Fatal()
+		}
+	}
+}