QmlDesginer: catch none critical busy exception

walCheckpointFull() is writing back the log which is not
critical and should not crash the application

Change-Id: Ie01cc9be35de30dc9b89bcb00e9cd4358887c3b2
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

src/libs/sqlite/sqlitedatabase.h

@@ -102,7 +102,10 @@ public:
     void walCheckpointFull() override
     {
         std::lock_guard<std::mutex> lock{m_databaseMutex};
-        m_databaseBackend.walCheckpointFull();
+        try {
+            m_databaseBackend.walCheckpointFull();
+        } catch (const StatementIsBusy &) {
+        }
     }
 
     void setUpdateHook(void *object,