fix : remove _{ } syntax from benchmark macro (#7822)

* commented use of common

* hack to pass tests

* another hack

* remove all commented code

* fix the easy tests

* temp hack

* follow through comma hack until better solution

* patch macro

* missed one

* update benchmarks

* update docs

* fix docs

* removed too much

* fix changes

Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>

Author: stanly-johnson

src/benchmarking.rs

@@ -58,8 +58,6 @@ fn add_vesting_schedule<T: Config>(who: &T::AccountId) -> Result<(), &'static st
 }
 
 benchmarks! {
-	_ { }
-
 	vest_locked {
 		let l in 0 .. MaxLocksOf::<T>::get();