Describe the bug
asset upload showing path error

To Reproduce
Steps to reproduce the behavior:

1. install jans 1.1.6.nightly
2. upload properties file in jans-auth asset
3. edit uploaded asset and change jans-service to config-api
4. See error

Expected behavior
should not get 500 error,
if existing services is not configured then should get proper error message

Screenshots
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Desktop (please complete the following information):

• OS: ubuntu
• Browser [e.g. c
• Version [e.g. 22]
  jans 1.1.6.nightly
  DB -pgsql
  Smartphone (please complete the following information):
• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.