标准库的选择树显示优化，去除null的显示

deslrey

昨天 1f138c929cbec68a018f9ebcd16af35bcc9bb179

 src/api/cnas/resourceDemand/standardMaterial/standardMaterial.js

@@ -32,7 +32,7 @@
  return request({
    url: "/feStandardSubstance/exportOfStandardSubstanceList",
    method: "get",
    headers: { responseType: "blob" },
    responseType: "blob",
    params: query,
  });
}