QtCreator may hang in function symbolOccurrencesInText() of cpptoolsreuse.cpp

In the following code:

// Test Func
int TestFunc(int, void*);

int main()
{
    return TestFunc(0, nullptr);
}

int TestFunc(int value, void* ptr)
{
    return 0;
}

Rename "value" to "param" will hang QtCreator.

1. doule click "value"
2. 'Delete' it
3. type in "param"

In this case, symbolOccurrencesInText() loop forever because "symbolName" is empty.

It' ok if the comment "// Test Func" was absent.