Is there a reasonable fix for "warning: control reaches end of non-void function [-Wreturn-type]"?

I have implemented a simple templated class for a stack using linked list as such:

template <typename T>
struct Element
{
    T data;
    Element<T> *next;
};

template <typename T>
class Stack
{
private:
    Element<T> *m_top;

public:
    Stack();   // create an empty stack
    void push(T value);
    T pop();
    T top();
    bool isEmpty();
};

In the implementation of the top() which returns the value stored in the element at the top of the stack without removing it, I am getting the following error:

warning: control reaches end of non-void function [-Wreturn-type]

I have enabled -std=c++1 -pedantic -Wall options with g++. Here's the top():

template <typename T>
T Stack<T>::top()
{
    if (this->isEmpty()) // isEmpty() returns true if m_top == nullptr, false otherwise
    {
        std::cerr << "Stack empty!" << std::endl;
    }
    else
    {
        return m_top->data;
    }
}

Since there are only two possible values- either the stack is empty or not, therefore the if-else construct. But what do I put inside the if clause after the std::cerr statement to make the compiler happy and not get the warning? I cannot simply put a return; statement as the compiler expects a value to be returned. Also if the stack is empty, there is nothing to be returned.

Additional help:
Is it a good practice to leave the compiler complaining when you know the logic of the program is right?