FIX: Challenge Creation without Group not found error (#10525)

* prevent loading the party, if the user isn't part of one

* check for the party id too

website/client/components/challenges/challengeModal.vue

@@ -317,6 +317,8 @@ export default {
   methods: {
     async shown () {
       this.groups = await this.$store.dispatch('guilds:getMyGuilds');
+
+      if (this.user.party && this.user.party._id) {
         await this.$store.dispatch('party:getParty');
         const party = this.$store.state.party.data;
         if (party._id) {
@@ -326,6 +328,7 @@ export default {
             privacy: 'private',
           });
         }
+      }
 
       this.groups.push({
         name: this.$t('publicChallengesTitle'),