Exclude anonymous symbols from the QuickOpen

They're not overly useful to have in there, since they don't have a name
you could type to jump to them.

Reviewed-by: Roberto Raggi

src/plugins/cpptools/searchsymbols.cpp

@@ -196,6 +196,9 @@ void SearchSymbols::appendItem(const QString &name,
                                ModelItemInfo::ItemType type,
                                const Symbol *symbol)
 {
+    if (!symbol->name())
+        return;
+
     const QIcon icon = icons.iconForSymbol(symbol);
     items.append(ModelItemInfo(name, info, type,
                                QString::fromUtf8(symbol->fileName(), symbol->fileNameLength()),