Why is there a resistor inline with switch in blender motor?
It may be a fusible resistor designed to protect the wiring in case of a short in the bridge rectifier or the motor. 

It may also be a simple fuse. If it is open, then it either has opened early or it has done its job. The 200W rating would seem to indicate a higher amperage of fuse, but perhaps that's a peak rating or something like that. 

That item would be the first thing I'd check, and the second would be the bridge rectifier. Then the motor brushes.