SF-3833 Fix crash when selecting autocomplete entries

src/SIL.XForge.Scripture/ClientApp/src/app/shared/text/text.component.ts

@@ -603,7 +603,7 @@ export class TextComponent implements AfterViewInit, OnDestroy {
       )
       .subscribe(event => {
         // Set flag to use system cursor when any key is down that would move the cursor (avoids cursor lag issue)
-        if (this.nonPrintableCursorMoveKeys.has(event.key) || event.key.length === 1) {
+        if (this.nonPrintableCursorMoveKeys.has(event.key) || event.key?.length === 1) {
           this.pressedCursorMoveKeys.add(event.key);
 
           // Only set the flag when the user presses and holds (detect with a short timeout delay)

src/SIL.XForge.Scripture/ClientApp/src/app/translate/editor/suggestions.component.ts

@@ -267,7 +267,7 @@ export class SuggestionsComponent {
       case 'Escape':
         return true;
       default:
-        if (event.key.length !== 1) {
+        if (event.key?.length !== 1) {
           return false;
         }
         const keyCode = event.key.charCodeAt(0);

src/SIL.XForge.Scripture/ClientApp/src/app/translate/editor/translate-metrics-session.ts

@@ -39,7 +39,7 @@ function getKeyActivityType(event: KeyboardEvent): ActivityType {
       break;
 
     default:
-      if (event.key.length === 1 && !event.ctrlKey && !event.metaKey) {
+      if (event.key?.length === 1 && !event.ctrlKey && !event.metaKey) {
         type = ActivityType.Char;
       }
       break;