QmlJSEditor: Avoid crash

Do not try to access project settings if there
is no project.
Amends 0b47768ba1.

Fixes: QTCREATORBUG-31658
Change-Id: I5948f2b148369de23b4292a52d775f7467c472d6
Reviewed-by: Sami Shalayel <sami.shalayel@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmljseditor/qmljseditorsettings.cpp

@@ -172,6 +172,8 @@ bool QmllsSettingsManager::useLatestQmlls() const
 
 bool QmllsSettingsManager::useQmlls(Project* onProject) const
 {
+    if (!onProject)
+        return m_useQmlls;
     // check if disabled via project specific settings
     ProjectSettings projectSettings{onProject};