ROENROLL-1671 show cart tab when active term has no in-progress courses

src/app/degree-planner/term-container/term-container.component.html

@@ -168,7 +168,7 @@
 
   <!-- If this term is an active term -->
   <ng-container *ngIf="(term$ | async).era === 'active'">
-    <mat-tab-group (selectedTabChange)="changeVisibleCredits($event)" [selectedIndex]="0">
+    <mat-tab-group (selectedTabChange)="changeVisibleCredits($event)" [selectedIndex]="(enrolledCourses.length > 0) ? 0 : 1">
       <mat-tab [label]="'In Progress (' + enrolledCourses.length + ')'" aria-label="In progress courses">
         <ng-container cdkFocusinitial *ngTemplateOutlet="enrolled"></ng-container>
       </mat-tab>