MOBILE-3833 core: Fix current site table migration

src/core/services/sites.ts

@@ -1792,6 +1792,8 @@ export class CoreSitesProvider {
             await CoreConfig.set('current_site_id', siteId);
             await CoreApp.deleteTableSchema('current_site');
             await db.dropTable('current_site');
+        } catch {
+            // There was no current site, silence the error.
         } finally {
             await CoreConfig.set('current_site_migrated', 1);
         }