tokenize: avoid "terminate called after throwing an instance of 'std::out_of_range'"

src/tokenize.cpp

@@ -281,6 +281,7 @@ void Tokenizer::tokenizeCode(std::istream &code, const unsigned int FileIndex)
             {
                 // Extract the filename
                 line.erase(0, line.find("\"") + 1);
+                if (line.find("\"") != std::string::npos)
                     line.erase(line.find("\""));
 
                 // Relative path..