fixs some minor issues

main.go

@@ -59,7 +59,7 @@ func main() {
 		},
 		&cli.StringFlag{
 			Name:        "app-name",
-			Usage:       "the app for which the app default versions are for",
+			Usage:       "the app for which to retrieve the app default versions",
 			EnvVars:     []string{"APP_NAME"},
 			Destination: &AppName,
 		},

pkg/config/get.go

@@ -45,10 +45,11 @@ func get(ctx context.Context, url Source) ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer resp.Body.Close()
+
 	if resp.StatusCode != http.StatusOK {
 		return nil, fmt.Errorf("status %v", resp.Status)
 	}
-	defer resp.Body.Close()
 
 	return ioutil.ReadAll(resp.Body)
 }
@@ -165,8 +166,11 @@ func GetAppDefaultsConfig(content []byte, subKey, appName string) (*model.AppDef
 		if err := yaml.Unmarshal(content, &data); err != nil {
 			return nil, err
 		}
-		data, _ = data[subKey].(map[string]interface{})
-		if err := convert.ToObj(data, &allConfigs); err != nil {
+		subData, ok := data[subKey].(map[string]interface{})
+		if !ok {
+			return nil, fmt.Errorf("content at key %s expected to be map[string]interface{}, found %T instead", subKey, data[subKey])
+		}
+		if err := convert.ToObj(subData, &allConfigs); err != nil {
 			return nil, err
 		}
 	}