Mark instance config as 'blank allowed'
Mark instance config as 'blank allowed'

When a value is required it gets inserted into the database
automatically. This just bypasses the django verification.

recklessromeo/otm-core,RickMohr/otm-core,RickMohr/otm-core,RickMohr/otm-core,clever-crow-consulting/otm-core,maurizi/otm-core,recklessromeo/otm-core,recklessromeo/otm-core,maurizi/otm-core,maurizi/otm-core,maurizi/otm-core,clever-crow-consulting/otm-core,clever-crow-consulting/otm-core,RickMohr/otm-core,recklessromeo/otm-core,clever-crow-consulting/otm-core