terraform init taking too long triggers an empty error in the UI

[cmd-ntrf]

When creating a cluster and possibly the terraform module cache is empty, the post request in planCreation

mc-hub/frontend/src/components/cluster/ClusterDisplay.vue

Line 301 in 6ce719b

async planCreation() {

triggers an exception that is catch, but contains no message. Therefore, the error dialogbox is empty.

We should refactor planCreation code to better handle exceptions.