Debugger: Fix displaying LLDB states

Do not update states label with empty strings while
debugging as this overrides real state information
when performing additional actions like fetching
variables, stack, and so on  inside the debugger.

Change-Id: Ic026644931c845b6f3fb5bb422acc6e36e4a4142
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/lldb/lldbengine.cpp

@@ -407,9 +407,10 @@ void LldbEngine::handleResponse(const QString &response)
         const QString name = item.name();
         if (name == "result") {
             QString msg = item["status"].data();
-            if (!msg.isEmpty())
+            if (!msg.isEmpty()) {
                 msg[0] = msg.at(0).toUpper();
-            showStatusMessage(msg);
+                showStatusMessage(msg);
+            }
 
             int token = item["token"].toInt();
             showMessage(QString("%1^").arg(token), LogOutput);