api: return 404 when a path configuration is not found (#2067) (#2074)

this involves /v2/config/paths/edit and /v2/config/paths/remove

apidocs/openapi.yaml

@@ -605,6 +605,8 @@ paths:
           description: the request was successful.
         '400':
           description: invalid request.
+        '404':
+          description: configuration not found.
         '500':
           description: internal server error.
 
@@ -625,6 +627,8 @@ paths:
           description: the request was successful.
         '400':
           description: invalid request.
+        '404':
+          description: configuration not found.
         '500':
           description: internal server error.
 

internal/core/api.go

@@ -409,7 +409,7 @@ func (a *api) onConfigPathsEdit(ctx *gin.Context) {
 
 	newConfPath, ok := newConf.Paths[name]
 	if !ok {
-		ctx.AbortWithStatus(http.StatusBadRequest)
+		ctx.AbortWithStatus(http.StatusNotFound)
 		return
 	}