debug: clear error message for Hc<1

Author: franckgaga

src/controller/construct.jl

@@ -496,7 +496,9 @@ The vector is filled with `1`s, except for the last element which is `Hp - Hc +
 function move_blocking(Hp_arg::Int, Hc_arg::Int)
     Hp, Hc = Hp_arg, Hc_arg
     nb = fill(1, Hc)
-    nb[end] = Hp - Hc + 1
+    if Hc > 1 # if Hc < 1, it will crash later with a clear error message
+        nb[end] = Hp - Hc + 1
+    end
     return nb
 end
 

src/controller/transcription.jl

@@ -134,7 +134,7 @@ The ``\mathbf{P_u}`` and ``\mathbf{T_u}`` matrices are defined in the Extended H
 
 # Extended Help
 !!! details "Extended Help"
-    With ``n_j``, the ``j``th element of the ``\mathbf{n_b}`` vector introduced in [`init_ZtoΔU`](@ref)
+    With ``n_j``, the ``j``th element of the ``\mathbf{n_b}`` vector definedc in [`init_ZtoΔU`](@ref)
     documentation, we introduce the ``\mathbf{Q}(j)`` matrix of size `(nu*nj, nu)`:
     ```math
     \mathbf{Q}(j) =         \begin{bmatrix}