QmlProject: Fix wrong "." level in project structure

Change-Id: I6b69a055aa2793ebf0b254ed2b54c008388cc094
Task-number: QTCREATORBUG-15044
Reviewed-by: Robert Loehning <robert.loehning@theqtcompany.com>

src/plugins/qmlprojectmanager/qmlprojectnodes.cpp

@@ -97,6 +97,8 @@ void QmlProjectNode::refresh()
             // plain old file format
             absoluteFilePath = fileInfo.filePath();
             relativeDirectory = m_project->projectDir().relativeFilePath(fileInfo.path());
+            if (relativeDirectory == QLatin1String("."))
+                relativeDirectory.clear();
         } else {
             absoluteFilePath = m_project->projectDir().absoluteFilePath(fileInfo.filePath());
             relativeDirectory = fileInfo.path();