Remove NONE and default requirement icons.

src/app/dars/audit/audit.component.html

@@ -165,15 +165,8 @@
                         <span class="cdk-visually-hidden">Requirement not complete</span>
                       </ng-container>
 
-                      <ng-container *ngSwitchCase="'NONE'">
-                        <mat-icon class="requirement-icon no-icon">remove_circle</mat-icon>
-                      </ng-container>
-
                       <ng-container *ngSwitchDefault>
-                        <mat-icon class="requirement-icon no-icon"
-                        matTooltip="Requirement uses in-progress credit/courses"
-                        matTooltipPosition="above">lens</mat-icon>
-                        <span class="cdk-visually-hidden">Requirement uses in-progress credit/courses</span>
+                        <span class="requirement-icon-spacer">&nbsp;</span>
                       </ng-container>
 
                     </ng-container>

src/app/dars/audit/audit.component.scss

@@ -285,6 +285,10 @@ $black: #000000;
   font-size: 1.75rem;
 }
 
+.requirement-icon-spacer {
+  width: 24px;
+}
+
 .content-type {
   margin-bottom: 5px;