Fix artifact load button

src/app/development-processes/running-process-select-output-artifact/running-process-select-output-artifact.component.html

@@ -27,8 +27,9 @@
           </option>
         </ng-container>
       </select>
-      <div class="input-group-append">
+      <div *ngIf="!artifact.internalArtifact" class="input-group-append">
         <button
+          [disabled]="artifactControl.value == null"
           class="btn btn-outline-primary"
           type="button"
           (click)="loadData(artifactControl.value)"