Fix cluster-store and hotbar-store migrations (#3208)

- kubeConfigPath was erroniously set to cluster.id
- Skip empty workspace hotbars
- Output a warn if updating or creating a cluster throws in
  cluster-store

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/common/cluster-store.ts

@@ -241,8 +241,8 @@ export class ClusterStore extends BaseStore<ClusterStoreModel> {
           cluster = new Cluster(clusterModel);
         }
         newClusters.set(clusterModel.id, cluster);
-      } catch {
-        // ignore
+      } catch (error) {
+        logger.warn(`[CLUSTER-STORE]: Failed to update/create a cluster: ${error}`);
       }
     }