酷酷的哀殿

When we remove hexo in package.json,the generate(or any other command) action won't work

3

``` { "name": "hexo-site", "version": "0.0.0", "private": true, "scripts": { "build": "hexo generate", "clean": "hexo clean", "deploy": "hexo deploy", "server": "hexo server" }, // "hexo": { // "version": "5.2.0" //...

Throw an err when we don't have hexo in package.json

1

As https://github.com/hexojs/hexo-cli/issues/249 mentioned, this commit hopes to add a prompt to facilitate the user to quickly identify the root cause of the problem Before:  After: 

Why DBImpl::Write not call signal when it release the lock ?

1

 这里没有释放signal，会导致 write 持续处于 Wait 状态 @ghemawat https://github.com/google/leveldb/commit/d79762e27369365a7ffe1f2e3a5c64b0632079e1#diff-6fdb755f590d9b01ecb89bd8ceb28577e85536d4472f8e4fc3addeb9a65f3645R1115-R1135