Implemenint injecting particles without direction

I was almost sure this was implemented in the past, but it was not working.

Now, if n = 0 or if n is not provided, particles are injected with the normal to the surface.

src/modules/moduleInject.f90

@@ -377,7 +377,13 @@ MODULE moduleInject
           !Assign particle type
           partInj(n)%species => self%species
 
-          direction = self%n
+          if (all(self%n == 0.D0)) then
+            direction =  randomEdge%normal
+
+          else
+            direction = self%n
+
+          end if
 
           partInj(n)%v = 0.D0