Unhandled promise rejection if build without releaser

[raffis]

Describe the bug

Build the app with nvm exec npm run build-linux-deb and install it throws some errors to stdout. Probably because it was not released via github but still not that nice:

raffael@ltp14006:~/dev/balloon/balloon-client-desktop$ /opt/Balloon/balloon-desktop -h
(node:27881) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open '/opt/Balloon/resources/app-update.yml'
(node:27881) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open '/opt/Balloon/resources/app-update.yml'
(node:27881) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:27881) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:27881) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
(node:27881) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

To Reproduce

nvm exec npm run build-linux-deb sudo dpkg -i dist/xxxx.deb

Expected behavior

No such errors.

Environment

• desktop client version: v1.3.0 dev

Additional context

Add any other context about the problem here.