w.ts

  private initNullProperties(target : any, source: any){
    let self = this;
    Object.keys(target).forEach(targetKey =>{
      if(target[targetKey] === null && source!== null && typeof source !== "undefined" && source[targetKey] !== null && typeof source[targetKey] === "object"){
        target[targetKey] = source[targetKey];
      }
      else if(target[targetKey] !== null && typeof target[targetKey] === "object" && source!== null && typeof source !== "undefined"){
        self.initNullProperties(target[targetKey], source[targetKey])
      }
    });
  }