LED- Resistor, does the position matter?
No, it does not matter. There are several cases:


The LED works: in this case the resistor will limit the current flow, and does not matter if it is before or after, since it is connected serial.
The LED does not work:


Electricity flows through the LED: it would go through the resistor anyway, either if it is before or after the LED.
Electricity does not flow through the LED: current will not flow anyway through the resistor because the circuit is not closed.