[FIX] fixed copy-paste mistake in error message

(However, the error message itself also seems dubious to me: Couldn't "NaN" be used to represent a missing double value?)
Merge pull request #802 from hendrikweisser/fix-toppbase-message

[FIX] fixed copy-paste mistake in TOPPBase error message
[FIX] MRMDecoy: Fix losses for higher charge states
[FIX] MRMDecoy: Fix losses for higher charge states
[FIX] MRMDecoy: Hack to enable specific losses with shuffling