Fix crash when searching for missing clips, correctly look for missing...

Fix crash when searching for missing clips, correctly look for missing playlists and clear effectstack when transition is unselected

src/doc/documentchecker.cpp

@@ -124,7 +124,7 @@ bool DocumentChecker::hasErrorInClips()
     max = documentProducers.count();
     QStringList verifiedPaths;
     QStringList serviceToCheck;
-    serviceToCheck << QStringLiteral("kdenlivetitle") << QStringLiteral("qimage") << QStringLiteral("pixbuf") << QStringLiteral("timewarp") << QStringLiteral("framebuffer");
+    serviceToCheck << QStringLiteral("kdenlivetitle") << QStringLiteral("qimage") << QStringLiteral("pixbuf") << QStringLiteral("timewarp") << QStringLiteral("framebuffer") << QStringLiteral("xml");
     for (int i = 0; i < max; ++i) {
         e = documentProducers.item(i).toElement();
 	QString service = EffectsList::property(e, QStringLiteral("mlt_service"));
@@ -523,7 +523,7 @@ void DocumentChecker::slotSearchClips()
     int ix = 0;
     bool fixed = false;
     m_ui.recursiveSearch->setChecked(true);
-    qApp->processEvents();
+    //TODO: make non modal
     QTreeWidgetItem *child = m_ui.treeWidget->topLevelItem(ix);
     QDir searchDir(newpath);
     while (child) {

src/timeline/customtrackview.cpp

@@ -7676,7 +7676,10 @@ void CustomTrackView::clearSelection(bool emitInfo)
     scene()->clearSelection();
     if (m_dragItem) m_dragItem->setMainSelectedClip(false);
     m_dragItem = NULL;
-    if (emitInfo) emit clipItemSelected(NULL);
+    if (emitInfo) {
+        emit clipItemSelected(NULL);
+        emit transitionItemSelected(NULL);
+    }
 }
 
 void CustomTrackView::updatePalette()