UI: Rename mail server value isDemo to showChangePassword. Fixed send test mail:…

… not work for empty password fields

@@ -126,6 +126,10 @@ public class AdminController extends BaseController {
             accessControlService.checkPermission(getCurrentUser(), Resource.ADMIN_SETTINGS, Operation.READ);
             adminSettings = checkNotNull(adminSettings);
             if (adminSettings.getKey().equals("mail")) {
+                if(!adminSettings.getJsonValue().has("password")) {
+                    AdminSettings mailSettings = checkNotNull(adminSettingsService.findAdminSettingsByKey(TenantId.SYS_TENANT_ID, "mail"));
+                    ((ObjectNode) adminSettings.getJsonValue()).put("password", mailSettings.getJsonValue().get("password").asText());
+                }
                 String email = getCurrentUser().getEmail();
                 mailService.sendTestMail(adminSettings.getJsonValue(), email);
             }

@@ -215,7 +215,7 @@ public class DefaultSystemDataLoaderService implements SystemDataLoaderService {
         node.put("password", "");
         node.put("tlsVersion", "TLSv1.2");//NOSONAR, key used to identify password field (not password value itself)
         node.put("enableProxy", false);
-        node.put("isDemo", true);
+        node.put("showChangePassword", false);
         mailSettings.setJsonValue(node);
         adminSettingsService.saveAdminSettings(TenantId.SYS_TENANT_ID, mailSettings);
     }

@@ -126,10 +126,10 @@
             <input matInput formControlName="username" placeholder="{{ 'common.enter-username' | translate }}"
                    autocomplete="new-username"/>
           </mat-form-field>
-          <mat-checkbox *ngIf="!isDemo" formControlName="changePassword" style="padding-bottom: 16px;">
+          <mat-checkbox *ngIf="showChangePassword" formControlName="changePassword" style="padding-bottom: 16px;">
             {{ 'admin.change-password' | translate }}
           </mat-checkbox>
-          <mat-form-field class="mat-block" *ngIf="mailSettings.get('changePassword').value || isDemo">
+          <mat-form-field class="mat-block" *ngIf="mailSettings.get('changePassword').value || !showChangePassword">
             <mat-label translate>common.password</mat-label>
             <input matInput formControlName="password" type="password"
                    placeholder="{{ 'common.enter-password' | translate }}" autocomplete="new-password">

@@ -25,7 +25,7 @@ import { AdminService } from '@core/http/admin.service';
 import { ActionNotificationShow } from '@core/notification/notification.actions';
 import { TranslateService } from '@ngx-translate/core';
 import { HasConfirmForm } from '@core/guards/confirm-on-exit.guard';
-import { deepClone, isString } from '@core/utils';
+import { isDefinedAndNotNull, isString } from '@core/utils';
 import { Subject } from 'rxjs';
 import { takeUntil } from 'rxjs/operators';
 
@@ -39,7 +39,7 @@ export class MailServerComponent extends PageComponent implements OnInit, OnDest
   mailSettings: FormGroup;
   adminSettings: AdminSettings<MailServerSettings>;
   smtpProtocols = ['smtp', 'smtps'];
-  isDemo = true;
+  showChangePassword = false;
 
   tlsVersions = ['TLSv1', 'TLSv1.1', 'TLSv1.2', 'TLSv1.3'];
 
@@ -61,10 +61,11 @@ export class MailServerComponent extends PageComponent implements OnInit, OnDest
         if (this.adminSettings.jsonValue && isString(this.adminSettings.jsonValue.enableTls)) {
           this.adminSettings.jsonValue.enableTls = (this.adminSettings.jsonValue.enableTls as any) === 'true';
         }
-        this.isDemo = this.adminSettings.jsonValue.isDemo;
-        delete this.adminSettings.jsonValue.isDemo;
+        this.showChangePassword =
+          isDefinedAndNotNull(this.adminSettings.jsonValue.showChangePassword) ? this.adminSettings.jsonValue.showChangePassword : true ;
+        delete this.adminSettings.jsonValue.showChangePassword;
         this.mailSettings.reset(this.adminSettings.jsonValue);
-        this.enableMailPassword(this.isDemo);
+        this.enableMailPassword(!this.showChangePassword);
         this.enableProxyChanged();
       }
     );
@@ -147,11 +148,9 @@ export class MailServerComponent extends PageComponent implements OnInit, OnDest
     this.adminSettings.jsonValue = {...this.adminSettings.jsonValue, ...this.mailSettingsFormValue};
     this.adminService.saveAdminSettings(this.adminSettings).subscribe(
       (adminSettings) => {
-        adminSettings.jsonValue.password = this.mailSettings.value.password;
         this.adminSettings = adminSettings;
-        const formSettings = deepClone(this.adminSettings.jsonValue);
-        formSettings.changePassword = this.mailSettings.get('changePassword').value || this.isDemo;
-        this.mailSettings.reset(formSettings, {emitEvent: false});
+        this.showChangePassword = true;
+        this.mailSettings.reset(this.adminSettings.jsonValue);
       }
     );
   }

@@ -27,7 +27,7 @@ export interface AdminSettings<T> {
 export declare type SmtpProtocol = 'smtp' | 'smtps';
 
 export interface MailServerSettings {
-  isDemo: boolean;
+  showChangePassword: boolean;
   mailFrom: string;
   smtpProtocol: SmtpProtocol;
   smtpHost: string;