Debugger: Reset engine type and ABI for non-existing commands

Change-Id: I53bdb26ea4e48d59b4623076da9cdb4ff499c3e1
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/debugger/debuggeroptionspage.cpp

@@ -188,6 +188,9 @@ void DebuggerItemConfigWidget::commandWasChanged()
             tmp.reinitializeFromFile();
             setAbis(tmp.abiNames());
             m_engineType = tmp.engineType();
+        } else {
+            setAbis(QStringList());
+            m_engineType = NoEngineType;
         }
     }
     m_model->updateDebugger(item());