improve error handling in case of could not load player

src/app/sys-check/report/report.component.html

@@ -64,13 +64,13 @@
     </table>
   </mat-card-content>
 
-  <label>Export Your Report
-    <textarea style="width:100%; height: 8em" *ngIf="csvReport">{{csvReport}}</textarea>
+  <label *ngIf="csvReport">Export als CSV für Copy&Paste
+    <textarea style="width:100%; height: 8em">{{csvReport}}</textarea>
   </label>
 
   <mat-card-actions>
     <button *ngIf="canSave && isReady()" mat-raised-button color="primary" (click)="saveReport()" class="save_button">Senden</button>
-    <button *ngIf="canSave && isReady()" mat-raised-button (click)="exportReport()" class="save_button">Als CSV zum kopieren</button>
+    <button *ngIf="isReady()" mat-raised-button (click)="exportReport()" class="save_button">Als CSV zum kopieren</button>
   </mat-card-actions>
 
 </mat-card>

src/app/sys-check/unit-check/unit-check.component.ts

@@ -153,7 +153,7 @@ export class UnitCheckComponent implements OnInit, OnDestroy {
               {id: '0', type: 'unit/player', label: 'loading error', value: errorText + '\n' + player.labelSystem, warning: true}
             ]);
             this.dataLoading = false;
-            throw new Error(player.labelSystem);
+            return '';
           }
 
           if (player.value.length === 0) {
@@ -165,7 +165,7 @@ export class UnitCheckComponent implements OnInit, OnDestroy {
               {id: '0', type: 'unit/player', label: 'loading time', value: player.duration.toString(), warning: false}
             ]);
             this.dataLoading = false;
-            throw new Error('Error at: ' + errorText);
+            return '';
           }
 
           this.ds.unitData$.next([