Invite user to check his configuration if a problem occurs
Add more condition to display error in case of wrong API configuration and coming from banner notification
Prevent warning messages for some variables, Prevent Exception when picture doesn't exist in preview, set per default the dev mode to 1 because user receives BETA API Token first and some people doesn't set correctly the configuration
Version 1.0.7
Merge branch 'develop'

* develop:
  Version 1.0.7
  Prevent warning messages for some variables, Prevent Exception when picture doesn't exist in preview, set per default the dev mode to 1 because user receives BETA API Token first and some people doesn't set correctly the configuration
  Add more condition to display error in case of wrong API configuration and coming from banner notification
  Invite user to check his configuration if a problem occurs