re-trigger CI

Author: MasonProtter

src/variables.jl

@@ -199,6 +199,7 @@ function _varmap_to_vars(varmap::Dict, varlist; defaults = Dict(), check = false
         val = unwrap(fixpoint_sub(var, varmap; operator = Symbolics.Operator))
         values[var] = val
     end
+    nothing
     missingvars = setdiff(varlist, collect(keys(values)))
     check && (isempty(missingvars) || throw(MissingVariablesError(missingvars)))
     return [values[unwrap(var)] for var in varlist]