Fixes: Possible crash when searching for the definitions of enumerators.

src/plugins/cppeditor/cppeditor.cpp

@@ -593,6 +593,8 @@ Symbol *CPPEditor::findDefinition(Symbol *symbol)
 {
     if (symbol->isFunction())
         return 0; // symbol is a function definition.
+    else if (! symbol->type())
+        return 0;
 
     Function *funTy = symbol->type()->asFunctionType();
     if (! funTy)