Minor improvement

GearsAD · GearsAD · commit 830224174804 · 2020-07-19T00:32:06.000-05:00
diff --git a/src/services/DFGFactor.jl b/src/services/DFGFactor.jl
@@ -135,7 +135,7 @@ Return `::Bool` on whether given factor `fc::Symbol` is a prior in factor graph
 """
 function isPrior(dfg::G, fc::Symbol)::Bool where G <: AbstractDFG
   fco = getFactor(dfg, fc)
-  getFactorType(fco) isa AbstractPrior
+  getFactorType(fco) isa AbstractPrior || getFactorType(fco) isa FunctorSingleton
 end
 
 
