Python: initialize output parser exception state

Fixes: QTCREATORBUG-32214
Change-Id: Ied5aafad78b767b7cb5e2c9414de1cfa72d53358
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/python/pythonrunconfiguration.cpp

@@ -96,7 +96,7 @@ private:
 
     const QRegularExpression filePattern;
     QList<Task> m_tasks;
-    bool m_inTraceBack;
+    bool m_inTraceBack = false;
 };
 
 // RunConfiguration