Changing the generic application retrieval to get the application ids

This fixes the issue caused due to retrieving the application details by submiting the device id, becasue at the first storing of the application, they are not stored agaist a device. It get's mapped later with the device. Hence it caused a null pointer

components/device-mgt/org.wso2.carbon.device.mgt.core/src/main/java/org/wso2/carbon/device/mgt/core/app/mgt/ApplicationManagerProviderServiceImpl.java

@@ -239,7 +239,7 @@ public class ApplicationManagerProviderServiceImpl implements ApplicationManagem
                 }
                 if (!installedAppList.contains(application)) {
                     installedApp = applicationDAO.getApplication(application.getApplicationIdentifier(),
-                            application.getVersion(), device.getId(), tenantId);
+                            application.getVersion(), tenantId);
                     if (installedApp == null) {
                         appsToAdd.add(application);
                     } else {
@@ -255,7 +255,7 @@ public class ApplicationManagerProviderServiceImpl implements ApplicationManagem
             // Getting the applications ids for the second time
             for (Application application : appsToAdd) {
                 installedApp = applicationDAO.getApplication(application.getApplicationIdentifier(),
-                        application.getVersion(), device.getId(), tenantId);
+                        application.getVersion(), tenantId);
                 application.setId(installedApp.getId());
                 applicationsToMap.add(application);
             }