Fix bug in POST measures API.

api/src/main/nim/personal_measure_apipkg/api.nim

@@ -389,18 +389,22 @@ proc start*(ctx: PMApiContext): void =
 
         let slug =
           if jsonBody.hasKey("slug"): jsonBody["slug"].getStr.nameToSlug
-          else: jsonBody["slug"].getStr.nameToSlug
+          else: jsonBody["name"].getStr.nameToSlug
 
         let name =
           if jsonBody.hasKey("name"): jsonBody["name"].getStr
           else: jsonBody["slug"].getStr.capitalize
 
+        let config =
+          if jsonBody.hasKey("config"): jsonBody["config"]
+          else: newJObject()
+
         var newMeasure = Measure(
           userId: session.user.id,
           slug: slug,
           name: name,
           description: jsonBody.getIfExists("description").getStr(""),
-          config: jsonBody.getOrFail("config"))
+          config: config)
 
         resp($(%ctx.db.createMeasure(newMeasure)), JSON)