fixed 调用区块链接口

app/controllers/application_controller.rb

@@ -1103,7 +1103,7 @@ class ApplicationController < ActionController::Base
 					"author_time": commit['commit']['author']['date'],
 					"committer_time": commit['commit']['committer']['date'],
 					"content": commit['commit']['message'],
-					"commit_diff": commit_diff['Files'].to_s
+					"commit_diff": commit_diff.present? ? commit_diff['Files'].to_s : ""
 				}.to_json
 				resp_body = Blockchain::InvokeBlockchainApi.call(params)
 				if resp_body['status'] == 7