don't try to show source when no locations are given

Task-number: QTBUG-13466

2 files changed, 4 insertions, 4 deletions

diff --git a/tools/linguist/linguist/mainwindow.cpp b/tools/linguist/linguist/mainwindow.cpp
index 265df05..18baa24 100644
--- a/tools/linguist/linguist/mainwindow.cpp
+++ b/tools/linguist/linguist/mainwindow.cpp
@@ -1522,7 +1522,7 @@ void MainWindow::selectedMessageChanged(const QModelIndex &sortedIndex, const QM
             }
             m_phraseView->setSourceText(-1, QString());
         }
-        if (m) {
+        if (m && !m->fileName().isEmpty()) {
             if (hasFormPreview(m->fileName())) {
                 m_sourceAndFormView->setCurrentWidget(m_formPreviewView);
                 m_formPreviewView->setSourceContext(model, m);
@@ -1577,7 +1577,7 @@ void MainWindow::updateTranslation(const QStringList &translations)
         return;
 
     m->setTranslations(translations);
-    if (hasFormPreview(m->fileName()))
+    if (!m->fileName().isEmpty() && hasFormPreview(m->fileName()))
         m_formPreviewView->setSourceContext(m_currentIndex.model(), m);
     updateDanger(m_currentIndex, true);
 
@@ -1996,7 +1996,7 @@ void MainWindow::updateLatestModel(int model)
 
         if (m_currentIndex.isValid()) {
             if (MessageItem *item = m_dataModel->messageItem(m_currentIndex)) {
-                if (hasFormPreview(item->fileName()))
+                if (!item->fileName().isEmpty() && hasFormPreview(item->fileName()))
                     m_formPreviewView->setSourceContext(model, item);
                 if (enableRw && !item->isObsolete())
                     m_phraseView->setSourceText(model, item->text());
diff --git a/tools/linguist/linguist/sourcecodeview.cpp b/tools/linguist/linguist/sourcecodeview.cpp
index b8dd9c0..d2eef56 100644
--- a/tools/linguist/linguist/sourcecodeview.cpp
+++ b/tools/linguist/linguist/sourcecodeview.cpp
@@ -64,7 +64,7 @@ void SourceCodeView::setSourceContext(const QString &fileName, const int lineNum
     m_fileToLoad.clear();
     setToolTip(fileName);
 
-    if (fileName.isNull()) {
+    if (fileName.isEmpty()) {
         clear();
         m_currentFileName.clear();
         appendHtml(tr("<i>Source code not available</i>"));