Remove short-circuiting in coefficients(Fun, space)

Author: jishnub

src/Fun.jl

@@ -107,15 +107,7 @@ julia> coefficients(f, Legendre()) ≈ [0, 0, 1]
 true
 ```
 """
-function coefficients(f::Fun,msp::Space)
-    #zero can always be converted
-    fc = f.coefficients
-    if ncoefficients(f) == 0 || (ncoefficients(f) == 1 && fc[1] == 0)
-        convert(Vector, fc)
-    else
-        coefficients(fc, space(f), msp)
-    end
-end
+coefficients(f::Fun, msp::Space) = coefficients(coefficients(f), space(f), msp)
 coefficients(f::Fun,::Type{T}) where {T<:Space} = coefficients(f,T(domain(f)))
 
 """