Get rid of error:2406F079:random number generator:RAND_load_file when calling init

[fenekku]

Steps to Reproduce:
1- invenio-cli --flavour=RDM init
Expect:

project_name [My Site]: Demo RDM
project_shortname [demo-rdm]: 
project_site [demo-rdm.com]: 
github_repo [demo-rdm/demo-rdm]: 
description [Invenio RDM Demo RDM Instance]: 
author_name [CERN]: 
author_email [info@demo-rdm.com]: 
year [2019]: 
Select database:
1 - postgresql
2 - mysql
3 - sqlite
Choose from 1, 2, 3 (1, 2, 3) [1]: 
Select elasticsearch:
1 - 7
2 - 6
Choose from 1, 2 (1, 2) [1]: 
-------------------------------------------------------------------------------

Generating SSL certificate and private key for testing....
Generating a RSA private key
.++++
..............................................................................................................................................................................................................++++
writing new private key to 'docker/nginx/test.key'
-----
-------------------------------------------------------------------------------

Get:

project_name [My Site]: Demo RDM
project_shortname [demo-rdm]: 
project_site [demo-rdm.com]: 
github_repo [demo-rdm/demo-rdm]: 
description [Invenio RDM Demo RDM Instance]: 
author_name [CERN]: 
author_email [info@demo-rdm.com]: 
year [2019]: 
Select database:
1 - postgresql
2 - mysql
3 - sqlite
Choose from 1, 2, 3 (1, 2, 3) [1]: 
Select elasticsearch:
1 - 7
2 - 6
Choose from 1, 2 (1, 2) [1]: 
-------------------------------------------------------------------------------

Generating SSL certificate and private key for testing....
Can't load /home/me/.rnd into RNG
140196224754112:error:2406F079:random number generator:RAND_load_file:Cannot open file:../crypto/rand/randfile.c:88:Filename=/home/me/.rnd
Generating a RSA private key
.++++
..............................................................................................................................................................................................................++++
writing new private key to 'docker/nginx/test.key'
-----
-------------------------------------------------------------------------------

Environment: Ubuntu 18.04

This doesn't prevent the key from being generated, but it looks like something wrong happened. (It is documented too, so the problem is lessened a little).