[PM-24105] Remove usage of getUserKey on keyService (#16626)

• prefer undefined over null
• obtain required UserId once per method, before branching
• guards moved to beginning of methods
* lift UserId retrieval to occur once during import
* remove redundant userId retrieval

libs/angular/src/services/jslib-services.module.ts

@@ -791,6 +791,7 @@ const safeProviders: SafeProvider[] = [
     provide: InternalSendService,
     useClass: SendService,
     deps: [
+      AccountServiceAbstraction,
       KeyService,
       I18nServiceAbstraction,
       KeyGenerationService,

libs/angular/src/tools/send/add-edit.component.ts

@@ -260,12 +260,19 @@ export class AddEditComponent implements OnInit, OnDestroy {
       });
 
       if (this.editMode) {
-        this.sendService
-          .get$(this.sendId)
+        this.accountService.activeAccount$
           .pipe(
-            //Promise.reject will complete the BehaviourSubject, if desktop starts relying only on BehaviourSubject, this should be changed.
-            concatMap((s) =>
-              s instanceof Send ? s.decrypt() : Promise.reject(new Error("Failed to load send.")),
+            getUserId,
+            switchMap((userId) =>
+              this.sendService
+                .get$(this.sendId)
+                .pipe(
+                  concatMap((s) =>
+                    s instanceof Send
+                      ? s.decrypt(userId)
+                      : Promise.reject(new Error("Failed to load send.")),
+                  ),
+                ),
             ),
             takeUntil(this.destroy$),
           )