Fix concurrent asynchronous calls. (#675)

* Fix concurrent asynchronous calls.

* Remove test without mempool info websocket.

* Remove isloading$ variable.

frontend/src/app/components/blockchain/blockchain.component.ts

@@ -1,21 +1,11 @@
-import { Component, OnInit, OnDestroy, ChangeDetectionStrategy } from '@angular/core';
-import { StateService } from 'src/app/services/state.service';
-import { Subscription, Observable } from 'rxjs';
-
+import { Component, ChangeDetectionStrategy } from '@angular/core';
 @Component({
   selector: 'app-blockchain',
   templateUrl: './blockchain.component.html',
   styleUrls: ['./blockchain.component.scss'],
   changeDetection: ChangeDetectionStrategy.OnPush,
 })
-export class BlockchainComponent implements OnInit {
-  isLoading$: Observable<boolean>;
+export class BlockchainComponent {
 
-  constructor(
-    private stateService: StateService,
-  ) {}
-
-  ngOnInit() {
-    this.isLoading$ = this.stateService.isLoadingWebSocket$;
-  }
+  constructor() { }
 }