Fix membership renewal page when user has no previous memberships

Ghost Userrequested to merge
fix/renewal-page-no-membership into master

Closes #622 (closed)

Previous behaviour

Steps to reproduce:

  1. Create a user without memberships
  2. Go to the renewal page

New behaviour

Steps to validate that it works:

  1. Create a user without memberships
  2. Go to the renewal page
Edited by Ghost User

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