Handle errors if database is busy

[pjmc-oliveira]

Sometimes when executing a second request quickly after an initial request (that is still writing to the database), application will crash as database is busy

2019-04-02 17:39:53.700 [index.js] INFO: [POST] request to /analyse
2019-04-02 17:39:53.702 [clone.js] DEBUG: Initializing repository Clone from: 'https://github.com/pjmc-oliveira/HubListener'
2019-04-02 17:39:53.702 [clone.js] DEBUG: clonePath not passed, creating from URL
2019-04-02 17:39:53.702 [clone.js] DEBUG: Clone directory found at: '.../HubListener/src/repos/pjmc-oliveira/HubListener'
2019-04-02 17:39:53.703 [clone.js] DEBUG: Pulling latest changes...
2019-04-02 17:39:53.705 [clone.js] DEBUG: Changes successfuly pulled!
events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: SQLITE_BUSY: database is locked
Emitted 'error' event at:

[nodemon] app crashed - waiting for file changes before starting...