Submitted by pants
The function LPToken.set_minter() doesnt check that _minter doesnt equal zero before it sets it as the new minter.
This function can be invoked by mistake with the zero address as _minter, causing the system to lose its minter forever, without the option to set a new minter.
Manual code review.
Check that _minter doesnt equal zero before setting it as the new minter.
chickenpie347 (Boot Finance) confirmed)
